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Because calorically inert and metabolically inert are not the same thing.

I don’t think it’s a direct metabolic effect but an effect on how hunger it makes you and how it effects the sensation of other things you consume.

Because it has a very strong, unpleasant and overpowering taste in too large quantities.

Calorie is not the only metric for health

Some people like to know what they are putting in their bodies.