My father has had a low calorie diet all of his life. At 78, he is in perfect physical and mental condition. His doctor had only one concern; he is slowly losing weight each year and needs to reverse that. The doctor wanted to prescribe an appetite enhancing drug but my father explained he can not simply gain weight by eating more. It's as if his digestive system is already at a maximum threshold. I wonder if habitua…
Well, actually he can. It's not 100% just calories in/calories out, but it's very much that. If he eats potato chips and fries and lard every day he WILL gain weight.