Prospective study (4,730 women, ~10 years): prolonged fasting periods and weight-loss diets were linked to more hospitalizations for gallstones. Observational: association, causation not proven.
View the study (study) →Methylmercury from large fish crosses the placenta and damages neurodevelopment; in pregnancy, long-lived fish are limited.
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Mercury exists in several forms. Methylmercury (which accumulates in large, predatory fish) is neurotoxic, above all to the fetal and infant brain; elemental mercury (vapor, dental amalgams, some products) affects the central nervous system and the kidney.
Sources: large fish (tuna, swordfish, shark), amalgams, artisanal gold mining, some skin-lightening cosmetics. In pregnancy it is recommended to limit long-lived fish and prioritize small ones. Detoxification is slow; the key is to limit intake.
Information, not medical advice. Scientific evidence reflects the quality of the studies.