> However without being able to control people's diet, we don't know which way causation goes. Do low calorie sweeteners cause people to gain weight faster? Or

> However without being able to control people's diet, we don't know which way causation goes. Do low calorie sweeteners cause people to gain weight faster? Or does having a tendency towards gaining weight cause people to use low calorie sweeteners? And if it is a cause, why that would be. It seems overwhelmingly likely that the causality goes the other way, though.