>>Several studies have shown that different people can get different amounts of energy out of the same food, depending amongst others on their gut micro biome,

>>Several studies have shown that different people can get different amounts of energy out of the same food, depending amongst others on their gut micro biome, though stress also seems to play a role. It’s never going to be that simple. Nope still that simple. Your claim just means those people need less calories in to be in a state of calorie deficiency