• Restrictiveness: The biggest psychological factor here is how restrictive your diet is. Now, just to be clear, restriction is a necessity at times – a calorie deficit, for example, is a form of restriction – and you need to understand that to be successful in changing your body composition there will be times when you’re going to need to be disciplined and restrict certain foods. But, this should only be for a short period of time and not how you should be eating all the time.
The researchers hypothesize that participants who abstained from animal products dropped significantly more pounds since plant-based foods include loads of filling fiber and slow-to-digest complex carbs. Though more research is needed to confirm these results, the study authors write, "Vegetarian diets appeared to have significant benefits on weight reduction compared to non-vegetarian diets."
At its core, burning fat comes down to the process of lipolysis—the breaking down of fat lipids, explains Seedman. This happens in the mitochondria of the muscles, or the powerhouses of the cells, responsible for generating the energy our cells need to do their jobs. Exercise has been shown to improve mitochondria function, which then promotes fat breakdown, Seedman adds. Plus, working out helps regulate pretty much all the hormones that optimize fat loss.