The Perfect Health Diet takes a middle ground in regard to protein: We recommend eating about 15 % protein, and argue that both high protein and low protein diets are likely to be harmful; high protein diets by accelerating aging or by making protein available to gut bacteria for fermentation, producing a less beneficial gut flora and
generating nitrogenous toxins; low protein diets by starving the body of a
key nutrient needed to maintain bodily functions, especially liver, kidney, and immune function.