BACKGROUND Iodine is required for the production of thyroid hormones, which are necessary for normal brain development and cognition. Although several randomized trials examined the effect of iodine supplementation on cognitive performance in schoolchildren, the results were equivocal. OBJECTIVE We aimed to ascertain whether providing iodized oil to iodine-deficient children would affect thei...

OBJECTIVES The aim of the study was to determine the evolution of thyroid tests throughout pregnancy and postpartum in healthy women with and without iodine supplementation. METHODS This was a prospective, randomized, interventional study of iodine supplementation (150 μg/day) from the first trimester until 3 months postpartum versus controls. 111 pregnant women with normal initial thyroid te...

BACKGROUND Animal studies suggest that some perfluoroalkyl acids (PFAAs), including perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), and perfluorononanoic acid (PFNA) may impair thyroid function. Epidemiological findings, mostly related to adults, are inconsistent. OBJECTIVES We investigated whether concentrations of PFAAs were associated with thyroid function among 10,725 childre...

Ultraviolet-B (UV-B) radiation can have a negative impact on the growth and development of plants. Plants tolerant to UV-B alleviate these effects using UV-screening pigments that reduce the penetration of UV-B into mesophyll tissue. Little is known about the relative contribution of specific phenolic compounds to the screening capacity of leaves. The D1 and D2 proteins constituting the photosy...

Iron deficiency anemia is the most common type of anemia related to malnutrition world wide. It represents a major problem in developing countries, especially in Egypt. The aim of this study was carried out to elucidate the effect of different types of oral iron therapy (used for the treatment of iron deficiency anemia) on some hormones and minerals in anemic rats. Forty weanling male Sprague-D...

BACKGROUND Heavy metals, such as lead (Pb), mercury (Hg), and cadmium (Cd), are known toxicants, but their associations with the thyroid axis have not been well quantified at U.S. background levels. OBJECTIVES We investigated the relationships between thyroid hormones (total and free thyroxine [TT4 and FT4], total and free triiodothyronine [TT3 and FT3], thyroid-stimulating hormone [TSH], and...

Woodchucks ( n = 12-14/group) with circannual cycles entrained to northern versus southern hemisphere photoperiods were assessed monthly for 16 mo. Changes in serum total triiodothyronine (TT3), free thyroxine (T4), total thyroxine (TT4), and prolactin were determined in a subset of five animals per group. Metabolic hormone results were examined in relation to changes in body weight, food intak...

BACKGROUND It is well known that certain non-thyroidal critical illness may lead to euthyroid sick syndrome(ESS). There are little reports about the change of thyroid hormone in the children's central nervous system (CNS) infections. RESULTS The results of serum TT3, TT4 and TSH in these children were compared with those in 20 cases of healthy adults and 20 cases of adults with primary hypoth...

BACKGROUND The effect of feeding a limited iodine diet on radioactive iodine uptake in the thyroid glands of hyperthyroid cats is unknown. OBJECTIVES To determine how feeding limited dietary iodine affects radioactive iodine uptake by the thyroid glands of hyperthyroid cats. ANIMALS Eight geriatric cats with spontaneous hyperthyroidism. METHODS Prospective study of eight client owned hype...

Hyperthyroidism is the most common endocrine disease in domestic cats. This study examined whether dietary iodine restriction can reduce thyroid hormone concentrations in hyperthyroid cats. We performed a 12-week randomized, blinded, prospective study in which hyperthyroid pet cats housed with their owners were fed a control food (n=15) or a prototype restricted iodine food (n=18). Elemental an...