Is fasting an easier way to lose weight?
Yes. In this trial of 209 adults with obesity, intermittent fasting produced about the same weight loss as daily calorie counting, roughly 7 kg over six months, while feeling like less mental work. People who fasted said they spent far less effort watching what they ate.
That last part matters more than it sounds. Losing weight is hard, but sticking with a diet is often harder. This study set out to see whether a simpler eating pattern could match the old standby of counting every calorie, and whether it could do so without wearing people down.
What the researchers tested
The trial split 209 adults with obesity into three groups. One group followed intermittent fasting paired with early time-restricted eating. They ate only between 8 a.m. and noon, then fasted for about 20 hours, and they did this on three days each week that were not back to back. A second group did continuous calorie restriction, the familiar approach of cutting calories every single day. The third group received standard care and served as the comparison.
After six months, the researchers looked at how much weight people lost, but they also measured things that diets usually ignore. They tracked mood, depression scores, sleep, quality of life, and how much mental effort each eating plan demanded.
What the data show
Both diet groups lost a similar amount of weight, around 7 kg over the six months. On the scale, in other words, fasting and calorie counting finished in a near tie. The difference showed up in how the two approaches felt to follow.
People in the intermittent fasting group reported needing noticeably less mental effort to monitor their food intake. Instead of tracking every meal all day, they mainly had to watch the clock. Both dieting approaches also improved mood, lowered depression scores, and raised overall well-being, so the mental health benefits were not limited to one method.
Dr. Kumar’s Take
What stands out to me is not the weight number, it is the effort number. We have known for years that most diets can take weight off in the short term. The problem is that people quit, often because the daily grind of counting and logging food becomes exhausting. If fasting delivers the same result with less of that mental load, it may be easier to stick with over the long run, and staying with a plan is where most people fail.
I also like that both groups felt better mentally, not worse. There is a common fear that dieting makes people miserable or preoccupied with food. Here, mood and well-being improved. Still, this was six months, and the real test of any eating pattern is what happens after a year or two.
Who might benefit most
This approach looks best suited to people who struggle with daily calorie counting. If logging every meal feels like a second job, a plan built around a short eating window on a few days a week may fit your life better. The fasting schedule in this study was fairly strict, with a four-hour window and long fasts, so it will not suit everyone.
People with diabetes, those on blood sugar or blood pressure medication, pregnant women, and anyone with a history of disordered eating should talk to a doctor before trying long fasts. What worked in a supervised trial needs care when copied at home.
Practical Takeaways
- If daily calorie counting wears you down, an eating window of a few hours on two or three non-consecutive days may deliver similar weight loss with less mental strain.
- Expect a realistic result of around 7 kg over six months from either approach, not a dramatic overnight change, and treat steady loss as success.
- Talk to your doctor before starting long fasts if you take medication for blood sugar or blood pressure, since fasting can affect both.
- Watch your mood and sleep as you go, since this study found both diet patterns can improve well-being rather than harm it.
Related Studies and Research
- 4-hour vs 6-hour time-restricted feeding: effects on sleep and weight loss
- Time-restricted eating improves sleep, mood, and quality of life in overweight adults
- Mindfulness meditation for chronic insomnia: randomized controlled trial results
- Can a daily probiotic ease depression in older adults?
FAQs
Is intermittent fasting better than counting calories for weight loss?
Based on this trial, neither one clearly beat the other for weight loss, since both produced about 7 kg of loss over six months. The real difference was in ease of use, with fasting requiring less mental effort to follow. So the better choice may depend on your personality and schedule rather than on the number on the scale. Someone who hates logging food may do better with fasting, while someone who likes structure around meals may prefer counting calories.
What does the 8 a.m. to noon eating window actually mean?
In this study, people in the fasting group ate all their food for the day within a four-hour window that ran from 8 a.m. to noon. After noon they fasted for roughly 20 hours until the next morning. They followed this pattern on three days a week that were spread out rather than stacked together. On the other days they ate more normally, which made the plan easier to keep up.
Can dieting improve your mood and mental health?
In this trial, both the fasting group and the calorie counting group saw better mood, lower depression scores, and higher overall well-being. That challenges the idea that dieting always leaves people irritable or unhappy. Part of the benefit may come from the weight loss itself, and part may come from the sense of progress and control that a clear plan provides. Results will vary from person to person, so pay attention to how a new eating pattern affects you.
Bottom Line
For adults with obesity, intermittent fasting matched daily calorie counting for weight loss, taking off about 7 kg in six months, while asking for far less mental effort to stay on track. Both approaches also lifted mood and well-being. That makes fasting a real option worth discussing with your doctor, especially if the daily work of counting calories is what has stopped you before.
