Eat-Stop-Eat: a 24-hour fast once a week. Harder than it sounds, easier than you fear.
No windows, no points, no shakes. Just one or two full days a week where you don't eat, dinner to dinner. It works for the boring reason, and the evidence behind it is thinner than the fans admit.
The short version
- What it is
- One or two 24-hour fasts a week, usually dinner to dinner. Normal eating the rest of the time.
- Good for
- Cutting calories without daily rules. Resetting after a big day of eating.
- Bad at
- Being studied. Almost no trials test this exact pattern.
- Evidence
- Weak. Borrowed from studies of similar fasting.
- Our take
- The basis of our day-after-Rebel-Day fast. Once a week, not as a punishment.
What Eat-Stop-Eat actually is
Eat-Stop-Eat comes from a self-published e-book by Canadian Brad Pilon, first released in 2007.1 The rule fits on a sticky note: once or twice a week, don't eat for 24 hours. For example, finish dinner at 7 pm on Monday, then eat nothing until 7 pm on Tuesday. The other days you eat normally. Normally, not "twice as much to make up for it".
You never go a full calendar day without a meal. You eat dinner, skip breakfast and lunch the next day, and have dinner again. During the fast: water, black coffee, plain tea.
It belongs to the "intermittent fasting" family, alongside the 5:2 diet (two low-calorie days a week) and alternate-day fasting (every other day). Eat-Stop-Eat is the zero-calorie, once-a-week cousin.
How it works in your body
Over a 24-hour fast your body burns through the sugar stored in your liver, insulin drops low, and you lean more and more on fat for fuel. By the end of the day, you're running mainly on reserves.
The weight-loss effect is simple maths. Skip a full day's food once a week and you've taken out about a seventh of your weekly intake, as long as you don't make it back on the other days. Fasting doesn't melt fat any faster than eating less does. It's just a different way of eating less.
What you eat, what you don't
Eat (and drink)
- During the fast: water, sparkling water, black coffee, green or herbal tea
- A pinch of salt in water if you get a headache
- Break the fast with protein and vegetables: eggs, fish, tofu, greens
- A normal-sized meal, not a feast
- On the other days: real food, protein at every meal
Forget it
- Milk, sugar or syrup in your coffee during the fast
- Juice, smoothies, "just a bit of soup"
- Sweeteners and "zero" drinks
- Breaking the fast with pizza, pastries or a burger-and-fries combo
- "Earning" a binge the day before
- Fasting three or four days a week because one felt good
Alcohol on Eat-Stop-Eat
OK, now and then
- One glass of dry wine with a normal dinner on an eating day
- Spirits with soda water and lime, with food
- A light beer with a meal
Out
- Anything alcoholic on the fasting day. It has calories and hits an empty stomach.
- A drink to "celebrate" breaking the fast, before the food
- A big night out the day before a fast
- Cocktails, liqueurs, beer by the litre
50 Club: one glass of dry wine with the meal that breaks the fast, after you've eaten.
Alcohol puts fat burning on hold while your liver deals with it: two drinks cut it by about 73% in one small study.6 Never drink while fasting or on an empty stomach. All the details are in our alcohol guide.
What Eat-Stop-Eat is good for, with proof
Fewer calories, same as other fasting
Nobody has run a big trial of Eat-Stop-Eat itself. What we have are trials of similar weekly fasting patterns. The 2026 Cochrane review pooled 22 of them, almost 2,000 adults: intermittent fasting led to about the same weight loss as regular diet advice.2 So it works roughly as well as eating less in any other way. The question is only whether it suits you better.
Long-term fasters seem to have fewer heart problems
In Utah, researchers asked heart patients whether they routinely fasted. Many were members of the Church of Jesus Christ of Latter-day Saints, where regular fasting is a religious practice. Routine fasters were less likely to have diabetes (about 10% versus 22%) or coronary artery disease.3 Observational: these people also differ from non-fasters in plenty of other lifestyle habits. Interesting, not proof.
One rule, one day
The real selling point is psychological. Instead of watching every meal, you have one hard day and six normal ones. Some people find that much easier than a daily calorie target. Others find it miserable. Try it once before you build a life around it.
The uncomfortable truth
"Fast 24 hours and you'll burn a day's worth of fat." Partly. A good share of the early weight you see on the scale the next morning is water and stored sugar, which come back as soon as you eat. And the evidence across fasting methods is clear: it's no better than eating a bit less every day.2
The other trap is compensation. If the day before a fast becomes "last supper" and the day after becomes "I deserve this", the maths cancels out. A fast only works if the days around it stay normal.
The risks
- Diabetes medication. A full day without food on insulin or blood-sugar tablets is a recipe for dangerous lows. Even on 500 to 600 calorie fasting days, hypos roughly doubled in a type 2 diabetes trial, despite reduced medication.4 A zero-calorie day is stricter still. Never without your doctor.
- Binge risk. Long fasts can trigger overeating afterwards. Intermittent fasting has been linked with binge eating and other eating-disorder behaviours in young people.5
- Headache, dizziness, irritability, especially the first few times. Drink plenty of water, add a pinch of salt, and stand up slowly.
- Training. Hard workouts late in a 24-hour fast are a bad idea. Keep the fasting day light: walk, stretch, rest.
- Medication timing. Some medicines must be taken with food. Check with your doctor or pharmacist.
Allergies: watch the staples
The fast itself is allergen-free. The meal that breaks it isn't always. These are the break-fast foods we use most.
| Break-fast staple | Allergen (EU list of 14)7 | Swap |
|---|---|---|
| Eggs | Eggs | Tofu, chicken |
| Salmon, sardines | Fish | Chicken, lentils |
| Greek yoghurt, feta | Milk | Soy yoghurt, avocado |
| Bone broth with celery | Celery | Broth made without celery |
| Nuts and seeds on salad | Tree nuts, sesame | Pumpkin or sunflower seeds |
Don't do Eat-Stop-Eat if you…
- are pregnant or breastfeeding
- are under 18
- have ever had an eating disorder
- take insulin, sulfonylureas, SGLT2 or GLP-1 drugs
- are underweight
- have kidney disease, gout or a history of fainting
- take medication that must be taken with food
Healthen me asks about all of these and gives you a different plan if any apply.
How we use Eat-Stop-Eat in your plan
This is a building block, and you'll meet it once a week at most. Every plan has a Rebel Day: birthday cake, barbecue, eat what you like. The day after a Rebel Day is a fasting day. The kitchen closes after the Rebel Day dinner and opens again at your usual window the day after the fast. That's Eat-Stop-Eat, with a party first.
During the fast: water, black coffee, green tea. The meal that ends it is low-carb and protein-first, like every first meal in our plan. If Healthen me screens you out of fasting, the day after a Rebel Day is a lightest-food day instead. More on daily windows in time-restricted eating.
This article is general information, not medical advice. If you have a medical condition or take medication, talk to your doctor before changing how you eat.
Sources
- Pilon B. Eat Stop Eat. Self-published e-book, first released 2007; revised edition 2017.
- Garegnani LI et al. Intermittent fasting for adults with overweight or obesity. Cochrane Database of Systematic Reviews 2026, Issue 2, CD015610. doi.org/10.1002/14651858.CD015610.pub2
- Horne BD et al. Relation of routine, periodic fasting to risk of diabetes mellitus, and coronary artery disease in patients undergoing coronary angiography. American Journal of Cardiology 2012;109(11):1558–1562. doi.org/10.1016/j.amjcard.2012.01.379
- Corley BT et al. Intermittent fasting in type 2 diabetes mellitus and the risk of hypoglycaemia: a randomized controlled trial. Diabetic Medicine 2018;35(5):588–594. doi.org/10.1111/dme.13595
- Ganson KT et al. Intermittent fasting: describing engagement and associations with eating disorder behaviors and psychopathology among Canadian adolescents and young adults. Eating Behaviors 2022;47:101681. doi.org/10.1016/j.eatbeh.2022.101681
- Siler SQ, Neese RA, Hellerstein MK. De novo lipogenesis, lipid kinetics, and whole-body lipid balances in humans after acute alcohol consumption. American Journal of Clinical Nutrition 1999;70(5):928–936. pubmed.ncbi.nlm.nih.gov/10539756
- Regulation (EU) No 1169/2011 on food information to consumers, Annex II (the 14 allergens). eur-lex.europa.eu/eli/reg/2011/1169/oj