The increase in ketones that results from fat burning can cause minor, short-lived side effects, including dizziness, headache, low energy levels, and weakness. These symptoms simply indicate that your body has become more efficient at burning fat- they are the same sensations that long distance runners or athletes experience after long periods of exercise. The fact is, every cell in your body is capable of using ketones for energy, and your heart and brain run 25 percent more efficiently on ketones than they do on glucose. Although a low-carbohydrate diet raises ketone levels, the increase is a slight one. Most people- regardless of how they eat- have elevated levels of ketones when they wake in the morning, as a result of their overnight fast. The level of ketones your body produces on a low-carbohydrate diet is only slightly higher than this waking level. It does not even come close to the level that signals danger.
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