Feeling full is about volume of food. With high calorie dense foods like fast food, that’s going to be a ton of calories. With low calorie dense foods you can eat the same amount of food, and eat substantially less calories.
The only thing that matters in weight loss is calories in, calories out.
I get that it’s harder for some people, but finding less calorie dense foods that you enjoy will go a long way towards helping lose weight. Also, don’t drink pop unless it’s diet.
Dicks