vegetable oils are a fat, and no one who only eats fats, gains any weight; in fact they lose weight, which is the whole principle behind Atkins and keto. The id

vegetable oils are a fat, and no one who only eats fats, gains any weight; in fact they lose weight, which is the whole principle behind Atkins and keto. The idea that people gain weight from fats, is thus false. if all you did was eat fat calories, you would lose a ton of weight, because ketone bodies cannot be stored inside fat cells, only glucose fructose, etc. can. If all you did was eat protein calories, then yes, you could gain weight via gluconeogenesis (conversion of protein to glucose, again for fat storage and energy needs), although it would probably take more calories than carb calories to do so (since conversion likely results in molecular and energy losses); there is no such biochemistry available for ketones from fat