“First, when you try to restrict calories and exercise more, your body is hardwired to perceive a starvation situation. That makes you tired (so you move less and conserve energy) and hungry (so you eat more), and it slows down your metabolism (so you don’t die!). This “eat less, exercise more” formula is not too successful for most people. It can work for a short time, certainly, but less than 10 percent of people lose weight and keep it off for a year;4 you will almost always rebound and gain back the weight. Second, when you eat carbs and sugar, insulin spikes and your blood sugar drops. The insulin drives most of the available fuel in your bloodstream into fat cells, especially the fat cells around your middle, otherwise known as belly fat. So your body is starved of fuel, and this stimulates your brain5 to make you eat more.6 You could have a year’s worth of stored energy in your fat tissue and yet feel like you are starving. The only thing that can stop this vicious cycle is eating a lot of fat and cutting out the refined carbs and sugar. A high-fat, low-carb diet leads to a faster metabolism and sustained weight loss.”
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Mark Hyman,
Eat Fat Get Thin: Why the Fat We Eat Is the Key to Sustained Weight Loss and Vibrant Health
