Intermittent Fasting: Celebrity Trends vs Medical Evidence

Actor Sonali Bendre recently shared that she follows an 18–20 hour intermittent fasting routine, eating roughly one-and-a-half meals a day. As with many celebrity health practices, this has drawn public attention and sparked curiosity about trying similar methods. However, medical experts caution that while intermittent fasting can be effective for some, it is not a magic solution and may not suit everyone.

Intermittent fasting is an umbrella term for eating patterns that alternate between fasting and eating periods. Common forms include time-restricted eating (e.g., 16:8, 18:6), alternate-day fasting, and the 5:2 diet (severe calorie restriction on two days per week). These approaches primarily work by reducing the total time available for eating, which often leads to a lower calorie intake. For many people, this automatically eliminates late-night snacking, sugary drinks, and mindless grazing—a key reason why fasting often leads to weight loss.

But the underlying mechanism remains calorie restriction. A 2022 pooled analysis of 28 randomized trials, published in the journal Nutrients, compared intermittent fasting with continuous calorie restriction over periods ranging from 2 to 52 weeks. The analysis found that intermittent fasting did not produce superior weight loss compared with standard calorie restriction. Differences in body weight and fat mass were small and not statistically significant. While there were small additional reductions in waist circumference and fat-free mass with intermittent fasting, no meaningful advantages were observed for glucose, lipids, or blood pressure. The authors concluded that intermittent energy restriction diets were not superior to continuous energy restriction for improving body composition and cardiometabolic risk markers.

This evidence underscores an important point: fasting is better than unstructured eating, but it is not necessarily better than ordinary calorie restriction. If two people achieve similar calorie deficits—one through a fasting window and the other through smaller regular meals—their weight loss outcomes are likely comparable. This should be reassuring: one does not need to follow an extreme 18–20 hour fast to lose weight. Some individuals may thrive on time-restricted eating, while others may prefer three planned meals with controlled portions, adequate protein, and limited refined carbohydrates. Both approaches can work if they create a sustainable calorie deficit.

Celebrity-endorsed diets, however, often lack context. A celebrity may have access to expert supervision, planned meals, trainers, and years of body awareness. What works for them may not suit a teacher with an early schedule, a doctor on night shifts, a person with diabetes, a woman going through menopause, or an older adult with low muscle mass. Muscle preservation is especially important after age 40; rapid weight loss can lead to muscle loss, which is detrimental for long-term health. Extreme fasting may also raise risks for those with medical conditions, eating disorders, or specific nutritional needs.

The key takeaway is that intermittent fasting can be a valid tool for weight management, but it is not a one-size-fits-all solution. The decision to adopt it should be based on individual health status, lifestyle, and sustainable habits—not on celebrity allure. Consulting a healthcare professional before starting any restrictive diet is advisable, particularly for individuals with chronic conditions or medication regimens.

In summary, while intermittent fasting has gained popularity, the scientific evidence shows its effects are largely due to calorie restriction. Sustainable weight loss and good health depend on consistent, balanced eating patterns tailored to individual needs, not on the length of the fasting window.