Fasting
February 21st, 2012Whether you are of Catholic or Christian faith or not, you likely know that today is Fat Tuesday, or Mardi Gras. Its roots lie in the Christian calendar, as the “last hurrah” before Lent begins on Ash Wednesday. Ash Wednesday kicks off a period of 40 days of fasting or giving up certain indulgences as a form of sacrifice that ends on Easter Sunday.
I’m not going to discuss religion; however, fasting is often a part of Lent as well as many other religious holidays throughout the year. Fasting diets vary tremendously – there are juice fasts, bread and water fasts, raw food fasts and some fasts devoted to prayer or meditation only.
As a dietitian working in the world of cancer, I’ve been asked many times, “Can I fast?”. The reasons this question comes up are broad, but this question is important to address.
Consider these tips before thinking about a fast:
- Drinking enough fluids is essential when taking some cancer medications. Some medications are broken down by the body via the kidneys and drinking plenty of fluids is critical to preventing damage. Other medications may have a diuretic effect (causing water loss), and not drinking fluids could make the side effects worse or increase your risk of dehydration.
- Avoiding dehydration is very important. One of the most common side effects of cancer treatment is dehydration. Diarrhea and vomiting are risk factors for dehydration. Not eating or drinking on top of other side effects can lead to dehydration very quickly.
- If you take insulin or diabetes medications, fasting may cause low blood sugar. Talk with your physician who prescribes medications before making any changes to your diet. Low blood sugar can cause nausea, dizziness, weakness, confusion, and eventually seizures or coma.
- Fasting will not “detoxify” your body. Some fasts claim that they will cleanse the body of toxins; however, there is no science to prove that fasting removes toxins from the body, or that the body even needs to undergo detox. Our bodies do a good job of removing toxins naturally through the liver, colon, kidneys and sweating.
- Protein and nutrients found in foods help you recover from cancer treatments. Fasting will limit nutrients critical for healing. Inadequate nutrition will not only slow recovery after each treatment, but may lead to weight loss, which will make recovery even more difficult.
Generally speaking, fasting is not recommended during cancer treatment. Most importantly, talk with your physician before starting any fast.








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