Some thoughts
A dramatic example of the effect of food processing on a population's health is the history of epidemics of beri-beri in people subsisting on polished rice. Removing the outer layer of rice by polishing it removes with it the essential vitamin thiamine, causing beri-beri. Another example is the development of scurvy among infants in the late 1800s in the United States. It turned out that the vast majority of sufferers were being fed milk that had been heat-treated (as suggested by Pasteur) to control bacterial disease. Pasteurisation was effective against bacteria, but it destroyed the vitamin C. Excess protein consumption in the absence of alkalizing mineral intake (usually from fruits and vegetables) may leads to low grade acididosis in which calcium and glutamine may be leached from bone and muscle respectively to keep the blood pH steady. Where gross caloric intake is adequate, however, a more benign form of ketosis generally results. (This should not be confused with the very harmful ketoacidosis, seen primarily in diabetics and alcoholics.) The overall effect on physical health of a low-carbohydrate diet -- especially concerning blood lipids, bone mass, potential osteoporosis, and possible strain on the liver and kidneys -- is the subject of an impassioned debate, which has not been resolved. All reputable authories agree, however, that excess protein consumption requires additional water intake to prevent dehydration.
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