Dr. Dukan does not approve of protein shakes. A big part of the diet is learning to eat proper, healthy food and you should be getting all the protein you need from the allowed foods.
With that said it is OK to use these on rare occasions or in an emergency. As they are a better option than succumbing to junk food.
You should then take care to make sure there is no sugar added and that the fat contents are within the allowed range.
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