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The gathering spawned a vigorous national movement centered on the Farm Chemurgic Council. In 1938, he told how the South could rebuild its soil through wide use of compost. In 1942, he wrote of his success in producing a soap composed, in part, of refuse scraped from the floor of a peanut-shelling plant. Certainly he was a remarkable, multitalented man who started with little, rose to a position of influence, and worked hard to help others live better lives. Writer James Saxon Childers, for example, claimed that according to "experts," Carver had "probably done more than any other living man to rehabilitate agriculture in the South. Washington and others at Tuskegee criticize his failings as an administrator, Carver must have found such words particularly satisfying. But his involvement with that industry did not come until peanuts were a wellestablished crop in the South. It is impossible to know how much the publicity surrounding him boosted the sale of peanut products or inspired farmers to plant the legume. But Carver himself observed, seventeen years after his first peanut bulletin, that few were being grown in Macon County. Carver had no entrepreneurial bent, and his own efforts to commercialize his discoveries were notably unsuccessful. During 1942, when someone from the War Production Board asked about the rubber product he had made from sweet potatoes years earlier, he admitted that his efforts had not progressed "into the essential pilot plant or 16 process development stage that it should have. Lake Imes, who served on the staff at Tuskegee for many years, said of Carver, "Many visitors have come to his laboratory expecting to pick up some valuable facts by direct questioning, but have had to content themselves with enigmatic replies. In 1924, he described his unusual approach to an audience at Marble Collegiate Church in New York. As reported in an Associated Press story, he said, "No books ever go into my laboratory. I never have to grope for methods; the method is revealed at the moment I am inspired to create something new. Anyone with the proper education could milk the peanut or abstract paper from suitable fibers, or rubber from the sweet potato or any other vine which secreted latex. His special contribution was to expose these hidden properties in plants to the public view and, by dramatizing them, serve as a signpost pointing the way for those who had the facilities to incorporate them into the contemporary pattern of living. A second could more aptly be described as a highway-one that all Southerners could travel-toward greater prosperity based on local waste materials and plant-based resources. Washington foresaw how opportunities in the North would draw away much of the Black rural population they were trying to help. And the hopes of Carver and the chemurgists for expansion of renewable raw materials in industry gave way, within decades, to cheap petrochemical alternatives. Certainly he had no exact picture of the social and environmental concerns that humanity would face in the early 21st century. But his approach to two significant challenges-establishing sustainable forms of agriculture and expanding the use of renewable resources in industry-had intriguing implications for today and tomorrow. Let us look more closely at his work in each of those areas and consider what perspective his overarching vision may offer to people on those same "trails" today. Carver Anticipates Sustainable Agriculture the term sustainable agriculture refers to a set of goals rather than to a specific farming system. There is no universally accepted definition, but one published in 1989 by the American Society of Agronomy captures the essence of the concept: A sustainable agriculture is one that, over the long term, enhances environmental quality and the resource base on which agriculture depends; provides for basic human food and fiber needs; is economically viable; and enhances the quality of life for farmers and society as a whole. Your plants will then be more apt to overcome the attacks of insects and any other enemy which come upon them. Tuskegee Institute, as well as many of the farmers that Carver sought to counsel, had limited financial resources. In a 1916 leaflet, Carver described how to make the compost and use it with wood ashes and waste lime. Describing his own farm boyhood during the 1890s and 1900s, Wheeler McMillen exaggerated only a little when he observed, "We were organic farmers and ate organic food, although, of course, we were not aware of that fact. Furthermore, in making his case for the benefits of natural fertilizers to Booker T. Washington, Carver could quote no less an establishment authority than Seaman Knapp: "Commercial fertilizers are costly; their excessive use tends to hasten the depletion of the soil, and they should never be considered a substitute for green crops or barnyard manure.
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Data from animal models and cell cultures indicate that exposure to dioxin and dioxin-like chemicals alters the development of autoimmune disorders. The new studies reviewed here do not change this conclusion, as the results continue to be inconsistent and inconclusive. Although there was an increase in the standard hospitalization rate for rheumatoid arthritis but not systemic lupus erythematosus among veterans, no serum or tissue levels of dioxin-like chemicals were provided to confirm exposure. They also had a higher prevalence of rheumatoid arthritis, but no data were provided linking the higher levels of pro-inflammatory cytokines in persons with rheumatoid arthritis. No other changes in association level between the relevant exposures and other cancer types were made as either there were no published studies or the new evidence supported the findings of earlier updates. The objective of this chapter is to provide an assessment of whether the occurrence of cancers in Vietnam veterans may be associated with exposures to herbicides that they may have experienced during their military service. In this update, if a new study reported on only a single type of cancer and did not revisit a previously studied population, then its design information is summarized here with its results; design information on studies that are updates of or new analyses on populations or cohorts that have been previously studied can be found in Chapter 5. In evaluating possible connections between herbicide exposure and the risk of cancer, the approach used to assess the exposure of study subjects is of critical importance in determining the overall relevance and usefulness of findings. Many other factors can influence cancer incidence, including screening methods, tobacco and alcohol use, diet, obesity, genetic predisposition, and medical history. Many of the veteran, occupational, and environmental studies reviewed by the committee did not fully control for important confounders. There is not enough information about the exposure experience of individual Vietnam veterans to permit combining exposure estimates for them with any potency estimates that might be derived from scientific research studies to quantify risk. The significant challenges in deriving useful quantitative estimates of the risks of various health outcomes in Vietnam veterans are explained in Chapter 2 of this report. The animal studies examining the carcinogenicity of 2,4-D, 2,4,5-T, and picloram have, in general, produced negative results, although some bioassays used in those studies would not meet current standards. Additional evidence of a lack of carcinogenic potential comes from negative findings on the genotoxic effects of assays conducted primarily in vitro that indicate that 2,4-D and 2,4,5-T are genotoxic only at very high concentrations. Treatment with cacodylic acid induced the formation of neoplasms of the lung when administered to mouse strains that are genetically susceptible to developing those tumors (Hayashi et al. Other studies have used the two-stage model of carcinogenesis in which animals are exposed first to a known genotoxic agent and then to a suspected tumor-promoting agent; with this model, cacodylic acid has been shown to act as a tumor promoter with respect to lung cancer (Yamanaka et al. Genetic disturbances arising from confirmed exposure to herbicides were evaluated by analyzing sister-chromatid exchanges in lymphocytes from a group of 24 New Zealand Vietnam War veterans and 23 matched control volunteers (Rowland et al. The distribution was skewed left, and the Vietnam veterans also had a much higher proportion of cells with sister-chromatid exchanges frequencies above the 95th percentile (17 sister chromatid exchanges per cell) than the controls (11. Nevertheless, the extrapolation of animal studies to humans should be viewed with caution since there are many biological differences between these species. However, as discussed in the next section, whether such carcinogenic potential contributes to an individual type of cancer must be evaluated on a case-by-case basis. All cancers share phenotypic characteristics: unregulated cell proliferation, increased cell survival, invasion outside normal tissue boundaries, and eventual metastasis. These mutations can occur in a variety of genes that positively (oncogenes) or negatively (tumor suppressor genes) control cell growth, cell death (apoptosis), or the repair of genes when mutations do occur (Hanahan and Weinberg, 2000). Hanahan and Weinberg further add that for a tumor to survive, four other changes are necessary: changes in metabolism that give cells a selective growth advantage, evasion of the immune system, genetic instability leading to additional mutations, and local inflammation. Recent work has drawn attention to the interaction of cancer cells and the tumor microenvironment. Both genetic (mutational) and epigenetic (non-mutational) effects of carcinogenic agents can further contribute to and stimulate oncogenesis. As discussed above and in Chapter 4, 2,4-D, 2,4,5-T, and picloram have shown little evidence of genotoxicity in laboratory studies, except at very high doses, and little ability to induce carcinogenesis in laboratory animals. Extrapolating organ-specific results from animal experiments to humans is problematic because of important differences between species in the overall susceptibility of various organs to cancer development and in organ-specific responses to putative carcinogens. Therefore, conclusions about the potential carcinogenicity of a chemical in humans rely heavily on the results of epidemiologic studies that examine evidence of an excess cancer risk for individual or multiple organ sites. The size of a cohort and the length of the observation period often constrain the number of cancer cases that are observed and which specific cancers have enough observed cases to permit analysis.
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Chapter 2: Relevance to Public Health: the Relevance to Public Health Section evaluates, interprets, and assesses the significance of toxicity data to human health. Chapter 3: Health Effects: Specific health effects of a given hazardous compound are reported by type of health effect (death, systemic, immunologic, reproductive), by route of exposure, and by length of exposure (acute, intermediate, and chronic). Please refer to the Public Health Statement to identify general health effects observed following exposure. Pediatrics: Four new sections have been added to each Toxicological Profile to address child health issues: Section 1. Other case studies of interest include Reproductive and Developmental Hazards; Skin Lesions and Environmental Exposures; Cholinesterase-Inhibiting Pesticide Toxicity; and numerous chemical-specific case studies. Managing Hazardous Materials Incidents is a three-volume set of recommendations for on-scene (prehospital) and hospital medical management of patients exposed during a hazardous materials incident. Department of Energy, the World Health Organization, and the International Atomic Energy Agency in the medical management of radiation accidents. The Health Effects Review Committee examines the health effects chapter of each profile for consistency and accuracy in interpreting health effects and classifying end points. The Research Implementation Branch reviews data needs sections to assure consistency across profiles and adherence to instructions in the Guidance. Marvin Rallison, Professor Emeritus of Pediatric Endocrinology and Metabolism, University of Utah School of Medicine, 1706 Oakridge Dr. Rose, Professor of Molecular Medicine, Johns Hopkins University, 615 North Wolfe St. Shore, Professor and Director, Division of Epidemiology and Biostatistics, New York University School of Medicine, 650 First Ave. All reviewers were selected in conformity with the conditions for peer review specified in Section 104(I)(13) of the Comprehensive Environmental Response, Compensation, and Liability Act, as amended. A list of databases reviewed and a list of unpublished documents cited are also included in the administrative record. Compartment Model to Represent Particle Deposition and Time-Dependent Particle Transport in the Respiratory Tract. National Radiological Protection Board of the United Kingdom Metabolic Model for Iodine. Diagram of the Global Iodine Cycle at Steady State Showing Environmental Compartments, Compartment Inventories in Grams (g), Transport Pathways, and Fluxes in Grams per Year (g/year). Estimated Thyroid Radiation Doses in Populations Studied for Radioiodine-related Cancers. Reference Respiratory Values for a General Caucasian Population at Different Levels of Activity. Reference Values of Parameters for the Compartment Model to Represent Time-dependent Particle Transport from the Human Respiratory Tract. Approximate Releases of 129I from Atmospheric and High Altitude Nuclear Weapons Tests. Concentration of Iodine, Chloride, and 129I/127I Ratio in Air and Precipitation as a Function of Location and Collection Time. This information is important because exposure to iodine may harm you and because these sites may be sources of exposure. When a substance is released from a large area, such as an industrial plant, or from a container, such as a drum or bottle, it enters the environment. You may be exposed by breathing, eating, or drinking the substance, or by skin contact. Naturally occurring sources of radiation are cosmic radiation from space or radioactive materials in soil or building materials. Man-made sources of radioactive materials are found in consumer products, industrial equipment, atom bomb fallout, and to a smaller extent from hospital waste and nuclear reactors. These factors include the dose (how much), the duration (how long), and how you come in contact with it. Iodine is a naturally occurring element that is essential for the good health of people and animals.
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Foster, acted as the general supervisor of the National Youth Administration -153 project. The objectives of the National Youth Administration B-153 and B-307 projects were to supervise "health and better conduct activities for youth whose families were on relief. The league sponsored its first "Flower Show and Neighborhood Fair" during the Depression, two of its objectives being to show attendees "how to make flowers, gardens and grass and how to solve some of the problems which are conducive to the creation of slums. In 1938 the vice president of the Chicago Urban League, Earl Dickerson, participated in a radio interview called "What the Urban League Means to Chicago" that was conducted by one of the most prominent African American club women and activists at that time, Irene McCoy Gaines. Gaines introduced herself on the radio as a "representative of the general public, and particularly of the women who are so vitally interested in the social, economic, and civic status of the citizens. She was the second child of Charles Vivien and Mamie Ellis McCoy, and the niece of "George Washington Ellis [who] had served with the U. She was a mother and the wife of the prominent lawyer, real-estate man, and civic leader Harris Barrett Gaines, who had served two terms in the Illinois legislature beginning in 1928. By 1938 Irene McCoy Gaines had served as the director of the Girls Work Division War Camp Community Service between 1917 and 1918 and was an active member of the Chicago Urban League during the same period. One of her crowning achievements was her presidential appointment to the Housing Commission under Hoover in 1930. We therefore addressed ourselves to the study of these conditions in several of our committees and joined other civic organizations by letters and telegrams in a demand upon the Mayor of this city for the appointment of a Negro to the Housing Board. It was with great disappointment that we read of his recent appointment of white men to the two vacancies on the housing authority. Their report urged "[t]hat for the welfare of the community, we must keep up our neighborhood in housing. Read literature on better homes; listen to radio broadcasts on prevention of disease and methods of disinfecting and disposing of refuse. He began his 140 interview by acknowledging that the Chicago Urban League felt "indebted to the organized women of Chicago because it was largely through their efforts that the Urban League was started. Joanna Snowden (also known as Joanna Cecilia Hudlum and Joanna Snowden Porter), respectfully referred to as the "Daughter of Fire Angel," was highly valued and recognized in the city among African American elites. Joanna Snowden was also from one of the most prominent native African American families in Chicago, referred to as "Old Settlers," and was a past president and historian of the "Old Settlers Club" at the time of the radio broadcast. Her parents, Joseph Henry and Anne Elizabeth Lewis Hudlum, lived in the "first house built for colored people and owned by them in 1857. The couple had one child, Joseph Edward, who was born two years after the marriage on November 19, 1886. She was also the organizer for the National Association of Colored Women and had been a Deputy Recorder for the Cook County Recorders Office from 1924 to 1927. Nurturers of a Beautifying Movement Based upon the failures and success of its Depression-era block movement, the league launched its most successful block movement between 1945 and 1954. These West Side league women aggressively and successfully recruited women block-club leaders who would eventually represent more than half of the block clubs in Chicago for most of the last ten years of the Block Beautiful movement. Ridley was unquestionably one of the persons in the Urban League most critically responsible for the success of the Block Beautiful movement. When the federal funding was discontinued for the Urban League in 1942, Rachel "was appointed director of the West Side activities by the Urban League, supervising a staff of two professionals and four volunteers. When Ridley left the league in 1952 after a decade of service, they honored her with a farewell tea held in the Woodrow Wilson Room at the International Relations Center. The tea was organized and orchestrated primarily by twenty-seven of her female league colleagues and friends. Through her wisdom and tireless energy she has enriched our progress and created goodwill for the League. Within two years of her departure, the Block Beautiful contest and movement would begin to falter. Miss Lillian Proctor Very little is known about the other key African American women block movement founders and supporters like Alva B.
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Table 3: Distribution of studied children by blood pressure group Blood pressure category Normotensive Prehypertensive Hypertensive Total Frequency 234 120 19 373 Percentage 62. There were significant differences among groups (normotensive, prehypertensive and hypertensive) with respect to classic biochemical markers (Table 4). All biochemical indicators based on the structural proteins of the lipoproteins also exhibited significant differences. With the exception of ApoA, higher values were found in the hypertensive children (Table 5). Lipid alterations found in the prehypertensive children magnify the importance of 12 ApoA mg/dL 18. The lower triglyceride numbers in prehypertensive children may have been due to fat distribution, a characteristic not examined in this study. Some studies have shown that hypertriglyceridemia is more strongly associated with body fat distribution and diets rich in saturated fats than with alterations in blood pressure values. Lp(a) concentrations normally show little variation throughout life, and in adulthood remain at levels similar to those in childhood. High Lp(a) concentrations have been reported in children with familial cardiovascular risk factors. Our results point to the need to ensure monitoring and control of prehypertensive and hypertensive children and adolescents in Cuba. Heart disease and stroke statistics2018 update: a report from the American Heart Association [published online ahead of print January 31, 2018]. Factores de riesgo cardiovascular y su relaciуn con la hipertensiуn arterial en adolescentes. Comportamiento de los factores de riesgo cardiovascular en niсos y adolescentes con hipertensiуn arterial esencial. Prevalencia de factores de riesgo cardiovascular y riesgo metabуlico en escolares, universitarios y mujeres de organizaciones sociales de base en distritos de Lima, Callao, La Libertad y Arequipa, Perъ 2011. Prevalencia de factores de riesgo cardiovascular en adolescentes de instituciones educativas. Prevalencia de factores de riesgo cardiovascular en escolares de un бrea rural y urbana de Colombia. National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescent. The Fourth Report on the diagnosis, evaluation, and treatment of high blood pressure in children and adolescents. Table 76, Prevalencia de diabetes mellitus, hipertensiуn arterial y asma bronquial segъn grupo de edad y sexo; p. Estudios arteriales no-invasivos para detecciуn temprana o valoraciуn de cambios arteriales en niсos y jуvenes expuestos a factores de riesgo cardiovascular y/o patologнas sistйmicas. Obesidad e hipertensiуn arterial: seсales aterosclerуticas tempranas en los escolares. Management of high blood pressure in children and adolescents: recommendations of the European Society of Hypertension. European Society of Hypertension-European Society of Cardiology Guidelines Committee. Triglycerides and the risk of coronary heart disease: 10,158 incident cases among 262,525 participants in 29 Western prospective studies. Prevalencia de factores de riesgo cardiovascular en adolescentes de escuelas pъblicas y privadas de la ciudad de Salta, aсo 2009. Saturated fat in the diet of Spanish children: relationship with the anthropometrical, alimentary, nutritional and lipid profiles. Riesgo cardiovascular en en poblaciуn infantil de 6 a 15 aсos con obesidad exуgena. Factores de riesgo cardiovasculares y su relaciуn con las alteraciones del metabolismo de los glъcidos y lнpidos.
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Measurements of arsenic levels in drinking water were available for the 138 villages from a census survey conducted by the Taiwanese government. Multivariate regression models were applied to assess the relationship between arsenic levels in drinking water and lung cancer mortality. After adjusting for age, arsenic levels above 640 ppb were associated with a significant increase in lung cancer mortality for both genders; however, no significant effect was observed at lower arsenic exposure levels. Regression analyses and stratified analyses confirmed a dose-response relationship at >640 ppb. Guo (2004) noted that the results of this investigation show a carcinogenic effect of high arsenic levels in drinking water on the lung. Guo (2004), however, recommended that further studies with exposure data on individuals were warranted to confirm these findings. In addition, the study design may have contributed to biases introduced by the effects of population mobility. Strengths of the study include that analyses adjusted for gender and age, and cases were ascertained using information from household registry offices in each township. Weaknesses of the investigation include the inherent limitations of ecological studies and the fact that smoking was not controlled for in the analysis. Study strengths include the adjustment of potential confounders (gender and age); mandatory registering of all births, deaths, marriages, divorces, and migration issues with the Household Registration Office in Taiwan, making it an accurate data source; and a comparable study population. Weaknesses of the study include cross-sectional mortality limitations and not adequately controlling for smoking histories. There were 21 pathologically proven primary urethral carcinomas diagnosed (7 females and 14 males) between 1988 and 2001. Seven of 14 male patients had reported an average of 23 years of chronic arsenic exposure from drinking water. In those with chronic arsenic exposure, there was an even greater association with bulbomembranous adenocarcinoma compared to those without chronic arsenic exposure (73% vs. The small number of cases and the lack of arsenic exposure information are study weaknesses. Strengths include similar access to medical care for bladder cancer, the adjustment for age and gender, and the mandatory registering of all births, deaths, marriages, divorces, and migration issues to the Household Registration Office in Taiwan, making it an accurate data source. Limitations of the study include the cross-sectional mortality study design and smoking history confounding. Four hundred and fifty-four residents identified in 1959 as living in an arsenic-polluted area of Niigata Prefecture, Japan, were followed until 1992. The mortality of these residents between October 1, 1959, and February 29, 1992, was examined using death certificates. These individuals used arsenic-contaminated well water, and none worked at a nearby factory that was the source of the water contamination. Death certificates for the people who died between 1959 and 1992 were examined and a total of 113 of the 454 residents were estimated to have consumed well water containing a high concentration of arsenic (1,000 ppb). The study also analyzed skin signs of chronic arsenicism, and results indicated that they were useful risk indicators for subsequent cancer development. These results indicate a relationship between well water arsenic exposure and lung and urinary tract cancers. The study also showed that arsenic-induced cancer could develop years following the end of arsenic exposure. For lung cancer, there was evidence of synergistic effects between arsenic exposure and smoking history. Strengths of this study include data on smoking history, age, and gender, and an examination of the cohort by three arsenic exposure categories. Weaknesses, however, include the lack of detailed arsenic intake information, a small study population, as well as possible misclassification and recall bias pertaining to smoking history. South America 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Hopenhayn-Rich et al. The study compiled arsenic measurements from a major water survey performed more than 50 years earlier. This study grouped counties into three defined arsenic exposure categories: low, medium, and high (groups were defined based on the location of counties and the concentrations were only provided for the high group, which had a mean arsenic level of 178 ppb).
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This might be because they lack knowledge of these therapies or are skeptical of and therefore hesitant to discuss or promote them. Trying these therapies also gives me a sense of hope and control, which is important to me. There is cost associated with this treatment, so I will discuss my pain control goals with the therapist before starting and agree on a specific number of treatments before re-evaluating benefit. I will also be sure not to change any medicines without discussing with you [neurologist] first. Natural products include plant-derived chemicals and products, vitamins and minerals, and probiotics. They are widely marketed and available and are often sold as nutritional supplements. Mind and body practices include a range of procedures and techniques administered by someone who is trained in that method. The focus is on the interaction between mind, body, social, mental, and spiritual factors, and include yoga, chiropractic manipulation, meditation, massage, and acupuncture. The information provided should not be taken as recommendations for these substances, but should be used as discussion points when consulting with your licensed health care professional. Vitamins are complex organic chemicals, meaning they can be broken down by chemical reaction; minerals are inorganic compounds, which cannot be broken down by chemical reaction. Both vitamins and minerals are found in foods and also can be taken as supplement pills. Research across many different disease states has indicated that people benefit more when they get their vitamins and minerals primarily from foods, rather than pills. This is based in part on the concept of food synergy: vitamins in their natural form are better absorbed and work together for benefits compared with the artificial ratios and chemical derivatives found in many vitamin supplements. Furthermore, there is no data to suggest that taking vitamin supplements when you are not actually deficient in those vitamins will improve health or symptoms. In other words, if you have regular levels of vitamin D, for example, you are not likely to receive benefits from taking extra vitamin D pills. It improves bone strength and protects against osteoporosis (low bone density) and fractures from falls. Research cautions that calcium in supplement form carries some risk not present with food sources of calcium. When researchers analyzed data from 8,000 people in 15 studies, they found that if 1,000 people were given calcium supplements for five years, they would experience 14 heart attacks, 10 strokes, and 13 deaths, in exchange for preventing just 26 fractures. It plays an important role in bone health by increasing how much calcium your bones can absorb. Vitamin D is fat-soluble (stored in body fat), so it can be dangerous if taken in high doses. Institute of Medicine recommends that a vitamin D level of 20 ng/mL (50 nmol/ liter) or above is adequate for bone health. B vitamins Diets low in B vitamins are linked with various negative effects, while diets high in B vitamins can lower risk for some conditions. For example: - Low vitamin B12 is linked to cognitive difficulties and peripheral neuropathy (loss of sensation in feet that can worsen balance). Furthermore, vitamins B6, B12, and folate can reduce excessive levels of homocysteine produced when levodopa is metabolized. This is beneficial, as elevated levels of homocysteine can cause blood clots, heart disease, and stroke. Repeated studies show strongest benefits when B vitamins are ingested from foods and fail to show a consistent benefit of taking vitamin B pills in the absence of vitamin B deficiency. Food sources · Vitamin B6 is found in poultry, fish, and organ meats, as well as potatoes and other starchy vegetables. In fact, taking high-dose vitamin E is linked to premature death, underscoring that it is preferable to consume vitamins from food rather than in pill form. Food sources - Vitamin A is found in beef liver and organ meats, but these are high in cholesterol, so limit their intake. Similar to vitamins and minerals, antioxidants from foods display stronger disease-fighting capacity than pill-based antioxidants. Colorful fruits and vegetables, legumes, green tea, coffee, whole grains, and many seeds and nuts are food sources of antioxidants.
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Geographicspecific geometric mean lifetime doses are estimated to have ranged from 0. The actual dose received by any individual depended on age of exposure, location, and milk consumption habits. The Hanford Nuclear Site in southeastern Washington reprocessed uranium to produce plutonium. Radioiodine was released to the atmosphere during the early years of operation of the facility. Thyroid radiation doses have been estimated using a dosimetry model developed in the Hanford Environmental Dose Reconstruction Project (Shipler et al. Deaths related to thyroid cancers (or to other cancers or causes) following the accident continue to be studied and possible associations between mortality and radioiodine exposures may eventually become evident. In general, radiation-induced thyroid cancers tend to be papillary carcinomas; these types of tumors tend to be non-fatal (30-year mortality was estimated to be approximately 8% in adults (Mazafaferri and Jhiang 1994). However, papillary carcinomas that occur in young children, the predominant age group for thyroid cancers observed after the Chernobyl accident, are more fatal then when they occur in adults (Harach and Williams 1995). The major systemic effects of exposures to radioiodine are on the thyroid gland; however, other systemic effects have been observed, including inflammation of the salivary glands (sialadentitis), following relatively high exposures to radioiodine such as those used for ablative treatment of thyroid cancers. Effects of Radioiodine on Thyroid Gland Function Extensive clinical use of radioiodine, principally 123I and 131I, for diagnostic purposes and 131I for treatment of thyrotoxicosis has provided a wealth of information on the effects of relatively high acute exposures on thyroid gland function. Radioiodine is cytotoxic to the thyroid gland and produces hypothyroidism at absorbed effective doses to the thyroid gland exceeding 2,500 rad (25 Gy). Thyroid gland doses of approximately 10,000-30,000 rad (300 Gy) can completely ablate the thyroid gland (Maxon and Saenger 2000). Current diagnostic uses of radioiodine involve much smaller exposures, typically 0. These exposures correspond to approximate thyroid radiation doses of 15 rad (15 cGy) and 613 rad (613 cGy) for 123I and 131I, respectively (McDougall and Cavalieri 2000). Several epidemiological studies have examined the relationship between oral exposure to 131I and thyroid gland nodularity. Thyroid nodules are irregular growths of the thyroid gland tissue that can be benign or cancerous. Nodules can be detected by physical palpation of the gland or by various imaging techniques. Palpation detects only larger (>1 cm) nodules, whereas ultrasound can detect nodules that are not palpable. However, when the thyroid radiation dose from 131I was calculated for each subject in each location, there was a correlation between radiation dose and formation of neoplasia of the thyroid, but not to nonneoplastic nodules (Kerber et al. The subjects were evaluated for palpable thyroid nodules during the period 19911992. Clinical cases have been reported in which congenital hypothyroidism occurred after maternal exposures to high doses of 131I during pregnancy for treatment of thyroid gland tumors (Green et al. However, the complex clinical picture and pharmacotherapy of the mothers for their thyroid condition during pregnancy makes direct associations between the radioiodine exposure and the clinical outcomes of the newborns highly uncertain. Effects on the fetal and newborn thyroid would be expected if mothers received ablative doses of 131I during pregnancy after approximately 12 weeks of gestation, when the fetal thyroid begins to take up iodide. A study of 73 infants and children born to 70 patients who received 131I for ablative treatment of thyroid cancer 210 years (mean, 5. A similar finding was reported in a study of 37 patients (47 infants) who received 131I, 160 months prior to conception (mean, 16. Evidence of acute radiation sickness was prevalent early after exposures, including nausea and vomiting, hematological suppression, and dermal radiation burns. Cases of thyroid gland disorders began to be detected in the exposed population in 1964, 10 years after the exposure, particularly in exposed children; these included cases of apparent growth retardation, myxedema, and thyroid gland neoplasms (Conard et al. This group of children had received an estimated thyroid dose exceeding 1,500 rad (15 Gy). Prevalence of hypothyroidism and thyroid radiation dose decreased with exposure age: 25% for ages 2 10 years (8001,500 rad, 815 Gy) and 9% for ages $10 years (335800 rad, 3. Prevalences in the exposed groups from Ailignae were 8% for exposure ages >10 years (135190 rad, 1. At about the same time, in 1964, cases of palpable thyroid gland nodules began to be identified in health screening programs (Conard 1984). The prevalence of thyroid nodularity had an age/dose profile similar to that of thyroid hypofunction.