For example, fish, fowl, and meat contains only fats and proteins - no carbohydrates and no fiber and almost no micronutrients except those that are in the blood of the creature. These large complex molecules were designed for animal food. Fat is the food energy storage form for animals. Mankind and animals have very limited carbohydrates stored in the form of glucose in the liver. Proteins are not stored.
Proteins are never deficient in an adequate caloric diet.
Excess protein must be eliminated. Prolonged excess protein intake leads to kidney disease and eventually failure. These substances constitute an important part of the human diet and that of many animals. Photosynthesis in green plants harnesses the energy of sunlight to convert carbon dioxide, water, and minerals into organic compounds and gaseous oxygen. Thus our world is filled with wholesome food as a result of photosynthesis.