This does not taste like a "diet" shake. My husband has actually started drinking them too because he thinks they taste just like chocolate milk (and he is picky!). The only concern is that it is mostly made out of milk and sugar, so I'm not sure how much "weight-loss" benefits it has but I use it as part of a balanced calorie intake. And its great when you're out and don't want to buy fast-food! Good buy. Will buy again.