A friend of mine told me an excellent joke that makes a kind of analogy to this. If you have an amount of swiss cheese, you'll have a certain amount of holes, therefore air, with that swiss cheese. Now, as you get more swiss cheese, you'll get more air, therefore less swiss cheese. So at one point, you'll get so much swiss cheese, you'll get so much air you won't be getting any swiss cheese. If only this logic worked for fats... TL;DR: You can eat all the cheese you want, as long as you have enough you won't gain any weight.