Risks

A sudden and large drop in carbs can cause short term side effects, such as:

• Constipation.
• Headache.
• Muscle cramps.

Severe carb limits can cause your body to break down fat into ketones for energy. This is called ketosis. Ketosis can cause side effects such as bad breath, headache, fatigue and weakness.

It's not clear what kind of possible long-term health risks a low-carb diet may pose. If you limit carbs in the long term, it may cause you to have too little of some vitamins or minerals and to have digestive issues.

Some health experts think that if you eat large amounts of fat and protein from animal sources, your risk of heart disease or certain cancers may go up.

If you opt to follow a low-carb diet, think about the fats and proteins you choose. Limit foods with saturated and trans fats, such as meat and high-fat dairy products. These foods may make your risk for heart disease go up.