Fasting for Better Health: What Science Says

Fasting - going without food for a specific time period - has become popular today because of its perceived health benefits. It may have become diet fad today but fasting isn’t new; it has been practiced for centuries across cultures and religions.

Types of Fasting

People fast in more than one way. While some observe fasts because of their religious beliefs, others keep fasts to detoxify and cleanse their body or lose weight or for health reasons like improving their metabolism etc.

·       Complete fasts: In this type of fasts, people don’t eat food and/or water for a certain period.

·       Intermittent fasting: This pattern involves fasting for 12 hours or longer

·       Alternate‑day fasting: Regular eating for one day, then eat very little or nothing the following day.

·       Weekly curbs: In this type of fasting, you restrict calorie intake on weekdays but do binge eating on weekends.

·       Liquid fasting: This involves having liquid diet only, including water, juices, teas etc.

Science of Fasting

When we eat daily, our brain uses glucose for energy stored in our body as glycogen. But if we go without food for 12 hours, the level of glycogen goes very low and then the body switches to burning fat and producing ketones as an alternative fuel. This process of switching is linked to several health benefits.

Fasting also triggers autophagy - a natural clean-up process where cells remove and recycle damaged parts, which supports healthier ageing.

Going without food also improves insulin sensitivity, helping the body control blood sugar more effectively and lowering the risk of type 2 diabetes.

The metabolic changes turned on by fasting may also provide protection against chronic diseases linked to overeating, making fasting a beneficial for overall health and wellness.

Health Benefits of Fasting

Blood sugar management
Several studies have found that fasting may help in diabetes control by improving blood sugar management. A 2023 study found that three days of intermittent fasting per week can reduce the risk of type 2 diabetes by increasing insulin sensitivity.
Falling insulin resistance can raise your body’s sensitivity to insulin, allowing it to transport glucose from your bloodstream to your cells more efficiently, according to healthline.com.

Fights inflammation
Some studies have found that fasting can help decrease levels of inflammation and promote better health, according to healthline.com. Inflammation may be involved in the development of chronic conditions, such as heart disease, cancer, and rheumatoid arthritis. According to healthline.com, one 2022 review of 18 studies found that intermittent fasting could significantly reduce levels of C-reactive protein, which is a marker of inflammation.

Improves Blood Pressure
A 2025 study found that 3‑week plan of alternate-day fasting helped overweight people by lowering blood pressure, making the heart work more efficiently, and improving blood flow. This means that fasting could be a natural way to support better heart health.

Helps in Weight Loss
Fasting, particularly intermittent fasting has been found to be more effective in losing weight in people compared to calorie restriction, studies found.

Fasting results reductions in body weight, fat, and waist circumference as lowers calorie intake along with triggering metabolic changes like improved insulin sensitivity and more fat burning.

Who Should Not Fast

·       Children under age 18.

·       Women who are pregnant or breastfeeding.

·       People with type 1 diabetes who take insulin.

·       Those with a history of eating disorders.

Disclaimer: This content is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider with any questions about your health or treatment options.