The birds are vegans.
Did you know that many birds eat vegetable food and chickens are fed by insects? Protein needs vary at different ages. Food is dark. Some nutritionists suggest giving up carbohydrates (including fruits) in favor of protein foods. Others suggest excluding animal food (protein?) of the ration. The truth is, you need to eat less. One of the longevity researchers identified such a pattern - no matter what diet a person adheres to, moderation in food, motor activity and a positive attitude to life is important.