There already are, although they are not zero calorie cookies they can be made with fats our body cannot digest. Some of the issues with this is you can get anal leakage from the resulting greasy liquid stools that you can’t fully hold in. So can we do it? Yes more or less. Is free of side effects, no. And that is why you don’t see more of it. Sugar substitutes seem to work better but it is not clear that this is side effect free either. Some studies show alterations of metabolism which potentially might be harmful, and lack of weight loss anyway.
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