Sure it's true, but as others have pointed out, the only way out is down. If they 'needed' 2000 calories a day, and ate 2000 calories worth of food, but only absorbed/digested 1800, they would lose weight! This is the 21st century's version of verbal garbage. It sounds like it is logical or actually makes sense, but when you look at it, it's just retards making sentences of random phrases.