> The idea that there are types of foods which make you gain weight is incorrect.
I'm sorry but you are wrong. Calories-In and Calories-Out might be the main proponent, but it is just not the whole story. And you can find tons of research on it.
A link to a recent one, done by Harvard Medical School: https://www.eurekalert.org/pub_releases/2018-11/bch-ldc11121...