Intermittent fasting: new research raises concern
Recent research suggests that intermittent fasting may hide unexpected risks
Intermittent fasting, a diet that involves periods of abstinence from food alternating with food windows, has become increasingly popular in recent years, promising a range of health benefits, from weight loss to improved metabolic health. However, recent research from the Massachusetts Institute of Technology (MIT) sheds new light on this practice, suggesting that it may hide unexpected risks.
The MIT study
MIT scientists found that mice submitted to prolonged fasting and subsequent refeeding cycles had a significantly higher risk of developing colon cancer. This surprising result has been attributed to a precise biological mechanism: during the refeeding phase, intestinal cells multiply in an accelerated way to repair tissues damaged by fasting. This rapid cell turnover, when combined with exposure to carcinogenic substances in food, increases the likelihood of genetic mutations and, consequently, the development of tumours.
The risks of recharging
The refeeding phase after a long period of fasting seems to be particularly critical. When animals were fed foods containing mutagens, such as well-cooked steaks, the risk of developing cancer increased significantly. This suggests that the combination of prolonged fasting and consumption of potentially harmful foods could be particularly dangerous for gut health.
What does this mean?
The results of the MIT study raise important questions about the safety of intermittent fasting. Although further research is needed to confirm these results in humans, this finding suggests that this practice, if not followed correctly, could increase the risk of developing certain types of cancer.
What to do?
- Consult a doctor: Before starting any new diet, it is essential to consult your doctor, especially if you have pre-existing health conditions
- Modulate fasting: If you decide to practice intermittent fasting, it is advisable to opt for shorter and less frequent periods of fasting, and consume a varied and balanced diet during the food windows
- Limit processed foods: Avoid ultra-processed foods, rich in additives and preservatives, and give preference to fresh and poorly processed foods
- Cooking caution: Limit the consumption of red and well-cooked meat, which may contain potentially carcinogenic substances
Intermittent fasting: benefits and risks
Intermittent fasting can offer health benefits, but it’s important to practice it consciously and safely. The MIT study results underline the importance of following a balanced approach and consulting a health professional before starting any new diet.