According to Vanderbilt University, juice fasting might be better than other forms of fasting, simply because it provides the body with some nutrients. Still, any form of fasting is a bad idea because it deprives the body of the calories needed to work properly. Juice fasting often is used as a "cleansing method," although some people might use it as a weight-loss technique. Never attempt a juice fast unless your doctor approves it.
Fatigue
One of the major problems with fasting is loss of energy. When you fast, you reduce your caloric intake to a bare minimum. Fruit juice contains some sugar so your caloric intake will be slightly higher if you consume it, but drinking a high amount of sugar at once will affect your blood sugar levels. This will increase your energy levels momentarily, followed by your blood sugar crashing. Once the crash occurs, your energy levels will plummet as well. People who follow a juice fast might experience fatigue, weakness and dizziness.
Dangers to Certain Populations
People who suffer from glucose problems, have diabetes or are sick or weak should not attempt a juice fast because the low-calorie intake, coupled with the high intake of sugar, can cause a number of problems in the body. Low blood pressure, nausea and headaches also are possible.
Emotional Changes
Any type of fast that affects your blood sugar also can affect your mood. The most common side effects are moodiness, depression and irritability. The low-calorie intake and irregular sugar intake also can affect your concentration and cause you to feel lightheaded.
Other Problems
Juice fasts can cause a number of other problems, including nutritional deficiencies, especially if the diet is maintained for long periods. Fasts also might cause you to overeat later. As you end your juice fast, you will probably be very hungry and end up abusing certain foods, such as carbohydrates.
References
- Vanderbilt University; Fasting: Body Cleansing or Body Starving?; Kelly Grimes; 2010
- MayoClinic.com; Do Detox Diets Offer Any Health Benefits?; Katherine Zeratsky, R.D., L.D.; April 2010
- "The Fasting Handbook: Dining from an Empty Bowl"; Jeremy Safron; Celestial Arts; 2005
- BBC News; Scientists Dismiss Detox Myth; January 2009
- "Today's Dietitian"; Spring Cleansing: Assessing the Benefits and Risks of Detox Diets; Juliann Schaeffer; May 2008
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