Risks

In general, the South Beach Diet is safe. It's important to follow the guidance in official South Beach Diet books.

Be aware that eating fewer carbs than the diet recommends has risks. A very low-carb diet may put your body in a state called ketosis. Ketosis happens when the body doesn't have enough blood sugar, also called glucose, for energy. So the body breaks down stored fat instead. This causes acids in the blood called ketones to build up.

Side effects from ketosis can include:

• Upset stomach.
• Muscle cramps.
• Headache.
• Frequent tiredness.
• Bad breath.
• Thirst or a very dry mouth.

The keto version of the South Beach Diet says it doesn't require you to reach ketosis or stay in it.