Here's an experiment you can run on yourself. Eat the same diet as you are now, but less of it. Take up alternate day fasting, or just skip a meal every day. Be rigorous - keep track of how much your eat, and eat less than you were. Do it for a couple of months.
You will, absolutely, definitely, without a doubt, lose weight, largely adipose tissue mass.
Everything else is either (a) discussion of nutritional quality with regard to what you are eating, which is a rat-hole that never ends and you will never do better than a good 80/20 result no matter how much time and energy you spend on it or (b) the self-delusion of people who don't want to give up their capacious eating habits.