You're partially right. It's a complete fallacy to think that just because you consume fat, you store fat. Any fat you eat is broken down before going into the

You're partially right. It's a complete fallacy to think that just because you consume fat, you store fat. Any fat you eat is broken down before going into the bloodstream, and is generally made available for the body to use as fuel in preference to being stored. The reason you store fat is because you have insulin in your bloodstream, which is a messenger telling cells to store energy. Insulin is released into the bloodstream in response to blood sugar levels going up. So, in order to avoid storing fat, you should avoid eating sugar (and other foods that get converted into sugar quickly, like most carbohydrates). People tend to lose weight if they consume mostly fat, and that is largely because eating fat doesn't raise blood sugar levels, and therefore doesn't stimulate insulin secretion. So it's more complicated than calories in minus calories out, and fat is good for more complicated reasons than it just taking longer to digest. Fructose does have a bad effect. But that's separate from the above - fructose is even more bad than just it being a sugar.