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The Health Benefits of Fasting and Intermittent Fasting

Thursday, September 21st 2023 10:00am 9 min read
Dr. Jessica Peatross dr.jess.md @drjessmd

Hospitalist & top functional MD who gets to the root cause. Stealth infection & environmental toxicity keynote speaker.

Fasting has been practiced by humans for centuries and holds significant cultural and religious importance in many societies. But beyond these traditional practices, a growing body of scientific research suggests that fasting and intermittent fasting offer a variety of health benefits. This article explores these benefits in depth.

Weight loss and belly fat reduction

Intermittent fasting can serve as an effective weight management strategy. As a form of calorie restriction, it can contribute to a significant reduction in body weight and belly fat (Varady, 2011). This occurs because fasting periods allow the body to shift from using glucose as its primary source of energy to using fat, thus promoting fat loss. Research published in The American Journal of Clinical Nutrition showed that intermittent fasting resulted in a 3-8% weight loss over 3-24 weeks, which was a significantly greater percentage than in those who did not fast (Horne et al., 2015).

Moreover, intermittent fasting not only reduces overall body weight but specifically targets abdominal fat. Abdominal fat is particularly detrimental to health, associated with increased risk for cardiovascular disease and diabetes. Studies show that intermittent fasting may be more effective at reducing this harmful abdominal fat than other dieting strategies (Varady, 2011).

Improved insulin sensitivity

Fasting also has a significant impact on insulin sensitivity. When we eat, our bodies break down carbohydrates into glucose, leading to an increase in blood sugar levels. In response, our bodies release insulin, which helps to transport the sugar into cells where it can be used as energy. Over time, constant eating can lead to cells becoming less responsive to insulin, a condition known as insulin resistance, which can potentially lead to Type 2 Diabetes (Heilbronn et al., 2005).

Research has shown that periods of fasting can improve insulin sensitivity, making our cells more responsive to insulin and thereby reducing blood sugar levels. One study showed that intermittent fasting could reduce fasting insulin levels by 20-31% (Halberg et al., 2005). This makes intermittent fasting a potentially effective dietary strategy for those at risk of developing type 2 diabetes.

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