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There are more and less extreme forms of every diet. What Keto is for weight loss, Low Carb is for maintenance.

If you are 5kg overweight, a "sustainable lifestyle change" will be sufficient. And there are those people for who even the severe risks of a gastric bypass outweigh the damage their weight does. Quite obviously, in between those extremes, there will be people were an unsustainable diet will be healthier than staying at their weight or losing it only slowly. And why not choose a diet that has been shown to minimize the loss of lean body mass.

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