Comment by willsun

Most of the studies I looked at would "enforce" diets through direction, coaching, and meal plans, while a few provided meals to participants. Very few required daily calorie tracking. So while it is possible there is an adherence improvement for certain diets (e.g. low-carb has better satiety, better adherence, and therefore better weight loss), that improvement doesn't appear to be significant enough to regularly appear in research studies. Of course, one could make the methodological critique (e.g. "the studies aren't good enough yet to detect this"), but at least it seems to set a ceiling on the magnitude of a possible adherence improvement.