Plus, there are both short-term and long-term health risks for all people associated with the keto diet. For example, upset stomach, headache, fatigue and dizzy spells. This is called the “keto flu.” Some people also report trouble sleeping. Cutting back on high-fiber vegetables, fruits and whole grains also can increase risk for constipation.
According to nutritionist Anthony Power, by drastically reducing cabrohydrates in the diet, increasing fat and pushing the body into ketosis, the body uses a more stable source of fuel. "Ketosis produces ketone bodies which are produced from the breakdown of fats in the liver. When the body calls on fat stores to supply energy, we lose weight. "When we dramatically limit carbohydrate intake, the body needs to look for an alternate fuel source, calling on the body to convert its supply of fat to glucose, a process called ketosis," Tuck said.
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