Oddbean new post about login | logout the reason low-fat diets ( like lean chicken breasts ) are not a good idea is because you still need Omega 3 ( a fat ) and half the vitamins are fat soluble and found in fatty foods. so at the end of the day you still need to either count calories or fast.
Fat doesn't make you get fat. Carbs do. Carbs trigger insulin release which causes glucose to be turned into glycogen and stimulates the synthesis and storage of fat.
what you said is a lie gurus like me tell children like @jack because we don't want to confuse them with complex reality the reason low-carb diets work is because all processed foods contain carbs, so by eliminating carbs you eliminate processed foods the actual damage in processed foods comes from seed oils, but seed oils are liquid and require starch as a sponge to hold them together - thus creating products like potato chips, french fries, donuts etc so yes, low-carb diets work, but not for the reasons you think
Its all of the above. Fat certainly is calorie dense, but in the specific case of a high-fat high-protein diets much of it is not absorbed.