Dietary fat don’t make you fat
Contrary to popular opinion, fats are not the demon. Through fats the body can produce energy and maintain essential organs such as the brain. Without fats your body wouldn’t work.
The same goes for insulin – it is necessary to provide organs with energy so they can work. It is necessary to keep blood sugar in normal levels. Without insulin the body wouldn’t work too. But besides providing fuel for energy, it stores it as fat. It’s how it handles excess sugar that can’t be momentarily used.
Some dogs won’t stop eating until you remove the food or until they ate all of it. Insulin is same. While there are sugars in the blood (broken-down carbs from food) it will collect and store. Overworked, it will do his job until the moment this function of his becomes much deteriorated after which the well-known diseases enter the scene.
Do your next step and give your body a new, different conditions on which it will have to adapt in the direction you want.