scenario that halts a lot of followers of low-carb, high-protein diets, such as Atkins, South Beach, Protein Power, and Paleo. Even cutting out sugar does not diminish insulin levels, because of all that protein. Again, the excess protein morphs into sugar and results in insulin release, which blocks the action of the hormone-sensitive lipase, preventing fat from converting to ketones. The side effects of this blockage typically manifest as headaches, low energy, aches, and the so-called Atkins or low-carb flu. To be clear, you have to cut out not only sugars but also proteins to stop this
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