Fat in diet won't affect weight gain over time

Absolutely wrong.

"People who want to maintain a healthy weight over time shouldn't obsess about their fat intake, new research shows.

The percentage of calories that a person got from fat, as opposed to protein or carbohydrates, had nothing to do with how much weight they gained in the coming years, the research team found."

If one does not overconsume Calories, this is substantially true.

But most people are fat and they got fat from overeating Calories.

When you overeat Calories as fat, 97% are added to your body as fat.

But when you overeat Calories as carbohydrate, for example, only 75% of the Calories are added to your body as fat.

The difference is the energy cost in converting carbs to body fat which is more than converting dietary fat into body fat.

Therefore, if you overeat Calories, you will add less fat to your body by overeating carbs instead of fat.

The trick, of course, is not to overconsume Calories at all.