Because my father had to wear expensive suits, he couldn't afford to gain or lose more than 5 lbs. His way to control his weight was to use a bread and butter plate. His food had to fit on there, nothing piled high or overlapping. He ate a full diet but watched the quantities. He never touched food between meals. He was 6'3 and maintained between 185 and 190 lbs for years. He was also a great walker, preferring to leave the car at home and walking a good two miles to work and again on the return. When he retired he took up riding a bicycle and at 70 he looked younger than when he retired at 67.