You don't need to. The notion that fasting cleanses actually “clean” the body is more of a marketing ploy than sound science. The human body naturally expels toxins via detoxification pathways in the gallbladder, liver, kidneys, digestive system, lungs and skin. The gastrointestinal tract contains 70% of the body’s immune response and one of its major roles is to remove waste from the body. Currently, there is little to no research that waste build-up or constipation (straining to pass hard stools) causes cancer, health issues or disease. That said, adding any of the following strategies to your lifestyle is easy, healthy and your best bet a "detoxifying" the body:
1. Minimize added sugars such as soda and sugar-sweetened beverages
2. Eat a diet rich in fresh organic fruits and vegetables. These foods contain fiber, protective phytonutrients and vitamins and minerals
3. Consume plant oils and unprocessed nuts for anti-inflammatory oils and minerals.
4. Eat adequate protein from high quality sources, fresh eggs, and vegetables. If you eat meat, choose sources that are humanely treated, free of hormones and antibiotics
5. For individuals with allergies, choose foods and supplements that are free of common food allergens such as gluten (from grains) and casein (from dairy)
6. Eliminate stimulants, caffeine, alcohol, tobacco products, modified food ingredients and chemicals and drink adequate amounts of clean water free of contaminants. For pure water consider a reverse osmosis filter system or RO water which can be found at many natural grocery and health food stores
7. Consume adequate fiber - 28 to 35 grams a day to promote proper bowel function
8. Get enough restorative sleep (7.5 to 9hrs/night of sound sleep or stage 4 sleep is optimal)
9. Make an effort to intake specific nutrients that have been found to support proper detoxification function, including epigallocatechin gallate from green tea, glucosinolates from cruciferous vegetables (broccoli, cauliflower, brussel sprouts, and cabbage), resveratrol from grapes and peanut skins, isoflavones from soybeans or fermented soy, and polyphenols and anthocyanidins from berries
10. Try hot lemon water with cayenne pepper before breakfast to stimulate the liver.
11. Add a tablespoon of apple cider vinegar in fresh water for the kidneys
12. Exercise enough to sweat to help open the pores to release toxins through the skin
13. Try body brushing and rebounding to stimulate lymph function for the immune system