The time frame can vary depending on a person's preferences and the plan they choose to follow. Typically, the eating window lasts between 6 and 12 hours. During the fasting period, one can drink water or weak, unsweetened tea to avoid dehydration. Intermittent fasting aims to be beneficial for most people. However, those with diabetes or other severe conditions like sarcopenia should consult their doctor before trying it.
Is Intermittent Fasting an Effective Way to Lose Weight?
The answer to this question will not be the same for everyone. Unfortunately, there is no one-size-fits-all solution to weight loss - each body reacts differently: what works well for some might be insufficient for others. It's also important to remember that intermittent fasting should be paired with well-balanced meals to avoid nutritional deficiencies and exhaustion.
Scientists have attempted several times to verify the hypothesis that intermittent fasting can benefit health and aid in weight loss. Some have shown that this way of eating can lead to significant weight loss (one study involved 30 men and women with obesity, with an observation period of 8 weeks, and the results were published in 2021 in the journal Nutrition & Diabetes).
Additionally, the Journal of Translational Medicine suggests that intermittent fasting can reduce the risk of metabolic syndrome and heart disease (based on a study involving 20 women with severe obesity, who experienced weight loss through fasting). Meanwhile, The Journal of Physiology reported that there are indications that intermittent fasting may provide benefits for people with type 2 diabetes, such as mild weight loss and better blood sugar management.
In 2022, the journal Frontiers in Nutrition published the results of a review of clinical and physical data from 43 randomized, controlled trials involving 2,438 participants aged 18 to 79. It found that intermittent fasting led to greater weight loss and positive changes in body composition compared to a regular diet. Another study, reported by the journal Cell, found that people who followed the principles of intermittent fasting and the eating window experienced improved insulin sensitivity, better function of pancreatic cells responsible for insulin production, lower blood pressure, and reduced oxidative stress (key indicators of heart health).
However, not all scientists agree that intermittent fasting and the eating window are effective. A randomized controlled clinical trial conducted in 2022, published in the New England Journal of Medicine, found that after 12 months of time-restricted eating, there were no significant benefits in terms of weight loss. Other studies (from 2019 and 2022) suggest that for people with overweight or obesity, intermittent fasting results in the same amount of weight loss as regular daily calorie restriction.
Who Can Benefit from Intermittent Fasting?
Intermittent fasting can be a good option for people who don’t like counting calories and prefer alternative (but equally effective) weight loss methods. However, it’s important to remember that there is a slight risk that weight loss through intermittent fasting may primarily involve muscle loss rather than fat. Therefore, it’s best to combine intermittent fasting with resistance training to strengthen muscles.
"For many people, intermittent fasting can be a simple way to reduce calorie intake without needing to follow complex and strict dietary rules," experts write in Medical News Today.
