I don't know what that calorie amount refers to--but I would imagine it would also be referring to the type of calories one would need to be healthy--like if you are looking at the amount of protein, fat, and carbs one needs to be healthy, then maybe it's been calculated that one would need at least 1200 to get all that in? I know I struggle to get enough protein even though I usually eat way more than 1200 calories but that is probably because I still eat a lot of sugar and am always way over on needed carbs amount.