For ages, people have been observing fasts for their religious, spiritual, or health benefits. But have you ever wondered what happens to our bodies when we are not eating for a long time? Scientists are now telling us how our physiological and metabolic systems are affected in such fasting periods and that there are good and bad sides to it.
The Science Behind Long-Term Fasting
The scientists in the research have come to the conclusion that the human body sets off a series of adaptive responses when fasting. The body uses glucose obtained from carbohydrates to get energy at first. Still, once 24-48 hours have passed without food, the glycogen that is stored goes to zero, and the body starts to use the fat through the process of burning called ketosis as the main source of energy.
Herein, the ketosis proceeds, the liver becomes the factory of the ketone bodies, which are produced from fats and can therefore be used by the brain and muscles instead of glucose. This change in metabolism goes hand-in-hand with several health benefits that are illustrated through:
- Improved insulin sensitivity – by fasting, the sugar in blood is kept at regulated levels that result in a lowered possibility of getting type 2 diabetes.
- Enhanced cellular repair – autophagy, the process during which the cells get rid of the parts that are damaged, is run during fasting, thus possibly inhibiting the development of cancer and neurodegenerative diseases.
- Reduced inflammation – by way of fasting, stellar scientists are informed that inflammation markers may go down, as a result that impairments such as arthritis and heart disease may be alleviated.
- Weight loss and fat reduction – Fasting impacts derived fat stores for weight loss, while at the same time it allows the retention of muscle mass, which is better than traditional calorie restriction.
Potential Risks and Considerations
Fasting by itself is a very good method; however, prolonged fasting (more than 72 hours) can also have negative effects, especially in groups of people. Here are some examples below:
- Electrolyte imbalances – The body that is fasting for a long time may lead to a deficiency of sodium and potassium, thus dizziness may occur; apart from that, the condition can also be accompanied by fatigue or irregular heartbeat.
- Muscle loss – The body will burn fat for energy, but it will eventually use the muscle protein as energy if the fast is very long.
- Adverse effects for some groups – Those groups of people who are pregnant, individuals with problems of eating disorders, or those who suffer from chronic illnesses should not fast for a long time, as they can get serious problems and should be treated by a medical professional if they decide to fast.
Key Takeaways
One study points out that short-term fasting (24–72 hours) may give a boost to metabolic and cell health, but a long time of fasting needs to be careful. Drinking enough water, taking in electrolytes, and eating a little bit of food regularly are ways to prevent problems as a result of fasting.
Before embarking on a long period of fasting, individuals should consult their healthcare providers so that they can be completely safe and get the most out of their fasting journey.
