Intermittent fasting involves scheduled periods throughout the day or week without eating.
It offers numerous benefits to the body and is a popular method for weight loss. However, its effectiveness depends on the type of fasting, as there are pros and cons, and each person’s body is different.
There are various types of fasting. Some methods include:
- Daily Window Fast – This involves eating between certain hours of the day, such as between noon and 6 pm, or 10 am and 5 pm.
- Weekly Fast – This involves eating on a regular schedule throughout most days of the week but having one or two days with fewer meals.
- Prolonged Fast – This involves going without food for more than 24 hours, which can extend up to 40 days with just water.
The Benefits of Going Without Food
Many people adopt fasting regimens for weight loss purposes. Omitting food for long hours has been shown to reduce caloric intake, blood sugar, blood pressure, and cholesterol levels. The body begins burning stored fat as fuel rather than the carbohydrates consumed on a regular schedule.
Fasting has also been linked to hinder cancer cell growth. Cancer cells feed on glucose, and without much of it present during fasting, they starve. The body’s cell also conserves energy by metabolizing insulin and removing glucose from the blood. Fasting puts a strain on cells and promotes cell regeneration, also known as autophagy, which works as a vacuum to destroy damage or any abnormal cells.
Health Problems Associated With Fasting
A study conducted by the American Heart Association discovered that people who ate in less than an 8-hour window had a 91% higher risk of dying from cardiovascular disease. This risk was found in those already diagnosed with heart disease or cancer. Researchers also noted that time-restricted eating did not reduce the risk of death in these patients.
The study did not analyze the type of foods consumed by participants, as certain diets can greatly contribute to health problems. In summary, the study concluded that fasting provides short-term benefits but can cause long-term health problems.
Prolonged fasting is considered riskier than other short-term fasting. While it is beneficial for insulin levels to decrease, especially for those who are diabetic, it can lead to sodium deficiencies due to the lack of food and excessive water consumption. An abnormally low sodium in the blood is called hyponatremia. Symptoms include nausea, headaches, loss of energy, spasms, and in severe cases, seizures, and coma. Hyponatremia also lowers blood pressure, making the heart work harder to pump blood, which can lead to heart failure.
Yet, it is still possible for people to consistently incorporate prolong fasting into their diet regimen. Dieticians recommend combatting the consequences of prolonged fasting by taking electrolytes to maintain sodium levels in the blood stream. These electrolyte minerals will not increase calories but will keep sodium present in the body.
Should You Fast?
It depends. Although there are many types of fasting, it is important to consult a doctor to ensure that your body can handle long periods without food. Those diagnosed with a health issue should stick to a short-term window fast. If it is your first time fasting, it is best to start by omitting one meal a day rather than restricting all meals so that the body can adjust. Once you find what works best for you, the benefits of fasting can significantly improve your life.
A randomized controlled trial that followed 100 obese individuals for one year did not find intermittent fasting to be more effective than daily calorie restriction.
Source:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7221140
https://www.mayoclinic.org/diseases-conditions/hyponatremia/symptoms-causes/syc-20373711
https://www.healthline.com/health/hyponatremia#symptoms
https://www.health.harvard.edu/heart-health/can-intermittent-fasting-improve-heart-health
https://my.clevelandclinic.org/health/articles/24058-autophagy