Biological Availability, Meat Products, Diet, Humans, Food plants, Vegetables, Authorship, Ecosystems, Acidification, Iron, Starches, Optimization, Meat, Eutrophication, Proteins, Reduction, Energy, Adequacy, Sustainability, Nutrients, Nonlinear programming, Beef, Low protein diet, Food, Milk, Greenhouse effect, Nutrient deficiency, Nutrition, Linear program...