I've been 1.8m and 64kg since I stopped growing. I know I overeat most of the time. Where does the additional energy go? Why is it stored as fat in some people, not in others. There is more to health than simple calories in = calories out.
Can you run us by a typical day of food? I'm not discrediting you, but from experience, what for you is overeating, for others is considered undereating.
