Why We Get Fat 14 years ago
Thing is , we don't know if that is due to paleo or due to being mindful of our eating and thus not overeating. So in a way, the diet can mask what really makes you lose weights, I.e. eating less and working out (if you do)
I think the more popular diets stick around because they are balanced enough to not make you sick and complex enough to make you watch how much you eat. The rest is due to personal preferences.