In the 1980's, our country started an experiment. Forty years later, we now know the experiment failed. In the 1980's, we were told that eating a low fat, whole grain diet was the healthiest way to go. Dozens, no hundreds, of low fat products glutted the grocery store aisles. People opted out of fat whenever possible and added whole grains into their diets. Did heart disease decrease? Did Type 2 Diabetes disappear? How about strokes? Orthopedic surgeries do to obesity? No. No. No. And again No.
Know why? Because fat was replaced by sugar (in some form). Also, if you don't already know this, carbohydrates of any kind are nothing more than complex molecular sugar chains. Your body does not know the difference between a Snickers bar and whole grain bread. If you eat sugar in any form and you do not immediately burn it off, it will get stored in the fat cells. The fat cells become very happy, all plumped up and they don't want to let go of their new rotund shapeliness. So losing weight from these happy fat cells is hard to do.
On the other hand, if you eat a reasonable amount of fat (30% of your total caloric intake or less), your body can metabolize the fat as an energy source.
So stop avoiding fat and start avoiding sugar.