“I know about thermo and for calorie consumption calculations, the body is a closed system.”
Really? You don’t poop? Ever? And you have 100% absorption of everything? If so, you are not human.
“So you’re saying that an overweight person can eat 1,200 calories a day, while burning 1,500 calories a day, and not lose weight?”
He will eventually lose weight, but it may well be as much muscle loss as fat. Fat people want to lose fat, and that means using the fat on the body to make up the caloric difference.
Further, if you include fat in your diet and eat less carb, you are more likely to get DOWN to a 1,200 calorie diet because you won’t be craving food constantly.
In my case, trying low-fat diets gave me incredible headaches and no energy at all. With a low carb diet, I can eat 3 eggs in the morning, go jogging or riding horses in the afternoon, and then eat a hamburger and some mixed veggies at night - all without getting headaches or feeling weak.
Humans are not machines. Portion control works a lot better when you are not craving things. And having tried it, I find I can drop inches off my waist easily on a low carb diet. Low fat diets have never worked for me.
BTW - my blood pressure is now less without medication than it was with medication before. If that means I”m eating wrong, then long live wrong eating!
BTW - since Americans have cut fat from their diets and gotten fatter doing so, what is your explanation? I don’t recall a lot of joggers when I was young...or health clubs.
Oh, good grief. This is such nonsense. The human body is very greedy when it comes to calories and it does a good job of absorbing them regardless of what you poop.
but it may well be as much muscle loss as fat.
No, that's not how your body works. Your body burns fat before going to muscle, and then to organs, for energy.
Humans are not machines.
The human body is a machine that runs on the food you eat. Those different macronutrients (fat, protein, carbs) can influence how much you eat or how quickly you become satiated, but people get fat for one reason, and that reason is consuming more energy than you expend. Period.