Your heart runs better on ketones

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. A low-carbohydrate diet slightly raises ketone levels.