For almost half of every year our ancestors ate no fruit, no green vegetables and (since it was impossible for them to feed more than a few oxen, cows, swine and poultry during the winter months) very little butter or fresh meat, and very few eggs. By the beginning of each successive spring, most of them were suffering, mildly or acutely, from scurvy, due to lack of vitamin C, and pellagra, caused by a shortage in their diet of the B complex.
