Is Fasting Bad for You?

Is Fasting Safe? Fasting for a few days probably won't hurt most people who are healthy, provided they don't get dehydrated. But fasting for long periods of time is bad for you. Your body needs vitamins, minerals, and other nutrients from food to stay healthy.

What are the negative effects of fasting?

Side effects of fasting include dizziness, headaches, low blood sugar, muscle aches, weakness, and fatigue. Prolonged fasting can lead to anemia, a weakened immune system, liver and kidney problems, and irregular heartbeat. Fasting can also result in vitamin and mineral deficiencies, muscle breakdown, and diarrhea.

How long can you safely fast?

To keep yourself safe, especially if you are new to fasting, consider limiting your fast periods to 24 hours or fewer and keeping a snack on hand in case you start to feel faint or ill. If you do become ill or are concerned about your health, make sure you stop fasting straight away.