Nutrition experts tend to recommend eating 3 balanced meals (350 to 600 calories each) and 1 to 3 sacks per day (between 150 and 200 calories each).
Yes, eating disorders have many causes, which are usually a complex interaction of genetic, psychological and social factors. However, social and psychological factors appear to be the leading causes. Specifically, many eating disorders relate to feelings of low self-esteem and poor body image.
Stress doesn't only influence your eating habits. Studies show it can affect your metabolism, too..