Updated: October 2026
In short: Intermittent fasting can help with weight loss because many people eat less overall that way. A Cochrane analysis of 22 studies with 1,995 participants found no significant advantage over normal diets for weight loss, though, and the evidence is very uncertain. So it's one method among several: worth it if it fits your daily life, not as a shortcut.
If you want to lose weight, you can hardly avoid intermittent fasting. But does it really work better than a normal diet? We show what the studies say, which method suits whom and how to honestly check whether it works for you.
Does intermittent fasting help with weight loss?
Yes, but not better than other methods with the same deficit. Healthline explains that the main reason intermittent fasting helps with weight loss is the lower overall calorie intake. According to aponet, a Cochrane analysis of 22 studies with 1,995 people found no significant advantages over usual diets either in weight loss or in quality of life.
The authors stress that the scientific basis is very uncertain and that only short-term effects of up to a year were studied. There is no more clarity than that, so the rule is: choose the method you can stick to.
Which methods are there?
| Method | How it works | Suits |
|---|---|---|
| 16/8 | fast for 16 hours, eat for 8 hours, daily | daily routine, little calorie counting |
| 14/10 | fast for 14 hours, eat for 10 hours | beginners, a gentle start |
| 5:2 | 500 to 600 kcal on 2 non-consecutive days | those who want to eat normally on other days |
| Eat-Stop-Eat | fast for 24 hours once or twice a week | experienced fasters, not for everyone |
The description of the methods comes from Healthline. You'll find details on the most popular variant in the article 16/8 Intermittent Fasting.
How much can you lose with intermittent fasting?
Healthline cites a 2020 review that found a weight loss of 0.8 to 13 percent of starting weight. The range is huge, and most studies were small and short. Nobody can credibly promise a fixed number.
The NHS recommends 0.5 to 1 kg per week as a steady pace. Anything above that is often water. The article Calculating a Calorie Deficit shows how to calculate your deficit.
Who benefits most from intermittent fasting?
People who like fixed rules and find them easier than calorie counting. If you like snacking in the evening, an early-closing eating window can save a lot of calories. If you aren't hungry in the morning, the late start suits you well.
- You like clear rules instead of calorie counting
- You like to snack in the evening and want to limit that
- You have little appetite in the morning
- You cook at fixed times anyway
Who is intermittent fasting not suitable for?
Healthline names people with diabetes, blood pressure problems, a history of eating disorders or low body weight, who should talk to a doctor first. Women should be mindful, because fasting can in some cases affect the cycle. Pregnant and breastfeeding women, children and teenagers don't fast.
If you suffer from hunger and weakness that don't subside, you should adjust the method or stop.
What does a weekly plan for weight loss with 16/8 look like?
An example plan with an eating window from 11 am to 7 pm. It shows how meals are distributed without you having to count calories. Adjust the times to your rhythm.
| Time | Meal | Example |
|---|---|---|
| 8 am to 11 am | Fasting window | Water, tea, black coffee |
| 11 am | first meal | Oats with quark, berries and nuts |
| 3 pm | Snack | Apple and a handful of almonds |
| 6 pm | second meal | Vegetable stir-fry with lentils or fish, potatoes |
| 7 pm | Window closes | Tea, water |
What matters is that both meals contain enough protein and vegetables. Only then do you stay full and not lose muscle.
What do doctors and professional societies say?
The Verbraucherzentrale describes intermittent fasting as helpful for some, as long as energy intake isn't restricted too much, and stresses that robust long-term studies are lacking. According to aponet, the Cochrane authors advise considering individually whether to continue with intermittent fasting, because it shows no clear advantages over other methods.
That is a sober assessment. If you have good experiences, stay with it. If not, switch without guilt.
What are typical mistakes?
The most common mistake is making up for everything in the eating window. Then the deficit is gone and you've gained nothing. The second: rules that are too strict, which you can't keep up after two weeks. The third: meals with lots of sugar and little protein, which quickly make you hungry again.
You'll find the rules on drinks and exceptions in the article Intermittent Fasting Rules, and example plans in the Daily Plan.
How do you check whether intermittent fasting works for you?
Give the method four weeks and keep a simple log: weight or waist measurement once a week, energy, sleep, cravings. If you feel good and your daily life gets easier, it's a good method. If not, a normal diet with a moderate deficit is just as good.
The Verbraucherzentrale sees intermittent fasting as helpful for some, as long as energy intake isn't restricted too much, and points to the lack of long-term studies.
Matching picks from frank.
If you want to try 5:2 or 16/8: on the Intermittent Fasting page you'll find methods and guides, and the Ginger Shots are a popular ritual to start the day. Count them in your eating window, because they contain calories.
You might also like
- What Is Intermittent Fasting and What Are the Rules?
- Free Intermittent Fasting Plan: Daily Plan for 16/8, 18/6, 14/10 and 5:2
- Juice Cleanse vs. 5:2 Intermittent Fasting: Which Suits Me Better?
Frequently asked questions about intermittent fasting for weight loss
How quickly do I lose weight with intermittent fasting?
That depends on the deficit. The NHS recommends 0.5 to 1 kg per week as a steady pace.
Is intermittent fasting better than counting calories?
According to the Cochrane analysis, it brings no significant advantage for weight loss. It can be easier, though, if you like fixed rules and don't feel like counting calories. What matters is that you can stick to the method long term.
Which method is best for weight loss?
The one you can stick to. 16/8 is practical for everyday life, while 5:2 requires a marked reduction on two days.
Can I lose muscle with intermittent fasting?
With too big a deficit that's possible. Make sure you get enough protein in both meals and keep moving, especially strength training on two days a week, as the NHS recommends.
Can I exercise during intermittent fasting?
Yes, light to moderate exercise is quite possible. It's best to schedule intense training within the eating window.
Note: This article is for general information and is not a substitute for medical or therapeutic advice. If you have complaints, pre-existing conditions, are pregnant or take medication, please talk to your doctor first.
