In 1928, Vilhjálmur Stefánsson and Karsten Andersen agreed to eat essentially nothing but animal foods for a year under medical observation. The results challenged assumptions about meat, ketosis, vitamin deficiency, and kidney health.
The relationship between ultraviolet exposure and melanoma is more complicated than the usual UV-equals-cancer message. Dose, sunburn, melanoma subtype, vitamin D production, diagnosis rates, and exposure patterns all matter.
UV radiation initiates skin damage, but the severity of the resulting inflammation may depend partly on the fatty-acid composition of the tissue being exposed. The dramatic rise in dietary linoleic acid, combined with changing sunscreen use and sun-exposure patterns, deserves closer study.
Plants can contain substantial amounts of minerals while delivering less of those minerals to the body because phytates bind iron, zinc, calcium, magnesium, and other positively charged minerals in the digestive tract. This has particular implications for vegan diets that rely heavily on grains, legumes, nuts, and seeds.