This is similar to the stress your body undergoes when you hit the gym. While exercising, that is a form of stress your body endures. As long as you give your body enough time to recover afterward, it will do your body good. The same applies for intermittent fasting — as long as continue to alternate between regular eating habits and fasting, it will continue to benefit you[*].
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. When you drink laxative concoctions during a fast, there is an increased risk of fluid imbalance and dehydration.

Suprisingly, though, fasting may be a good idea. A recent review by Stephen Anton and colleagues, in the journal Obesity, found that intermittent fasting may come with a variety of health benefits, including reducing inflammation, improving the ratio of lean tissue to fat, improving cognitive function, preventing type 2 diabetes, and possibly even prolonging life span.


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There are some downsides, however. As she explains, "By day two you may as well have all your calls forwarded to the toilet because you will be spending a lot of time in the bathroom. The first time I did the cleanse, I was out with my kids at the mall when all of a sudden I needed a bathroom, stat! It was a nightmare, trying to pack everyone up and find the restroom. I learned the mall is not the place you want to be when your body starts trying to eliminate toxins."
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