Dietary restriction, such as vegan or ketogenic diets, can indirectly lead to weight loss by reducing energy-dense food choices and affecting appetite.

“the second way that you can go about doing this is indirectly through dietary restriction right so you just you talked about a vegan diet hey you're taking a lot of things out of the diet um and many of them are energy dense so there's a very good chance you're going to lose weight just on the basis of the Restriction similarly with a ketogenic diet or something of that nature you're going to really generally eat a lot less and it's that uh effect of the diet on perhaps your appetite and food choices that's going to result in lower energy intake and therefore energy imbalance”