This doesn't tell the whole story, because once the switch occurs, you need to burn ketones for some time to gain any benefits. Back in 2014, I wrote about new evidence (from Valter Longo's research) that a longer fast, such as 3 days or more provide significant long-term health benefits. Three days is a long time to fast, but Longo has said that you don't need to do it more than a few times per year.
One idea underlying weight loss cleanses is that increasing bowel movements will reduce the calories the body uses, but your body absorbs nearly all the calories you consume before the food reaches your colon. Another theory in favor of weight loss cleanses holds that clearing out toxins -- chemicals from food, water and pollution -- assists the body in losing weight.
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