"Fast," in this case, is not about speed. It's about fasting.This diet, which started in the U.K., slashes your calories so drastically 2 days a week that you're basically fasting. That's not safe for everyone, so you should check with your doctor if you're considering trying it.The Fast Diet says that you shouldn't fast if you're pregnant or underweight, or if you have a history of eating disorders or diabetes, and that you should check with your doctor first if you take medication. The diet also isn't recommended for kids, teens, frail seniors, or anyone who isn't feeling well or has a fever.Mosley tried this "intermittent fasting" diet when his doctor showed him that though he was only a few pounds overweight, his cholesterol was high and his blood sugar was headed in the wrong direction. He writes that he knew fasting would be difficult, but his hunger pangs passed quicker than he expected. He also felt that fasting sharpened his senses and his brain. Plus, the diet delivered all the results he hoped for.
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