What to Eat During Intermittent Fasting
What to eat during intermittent fasting is ordinary food: vegetables, fruit, whole grains, pulses and protein, with fewer sugary drinks. Amounts count.
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Eat ordinary healthy food. Vegetables and fruit, whole grains, pulses and a protein source belong in the window, with fewer sugary drinks and salty processed foods. Trials suggest timing works mainly by helping people eat less, and it did not beat calorie restriction, so quality and amount still count.
- In a 12-month trial, an 8-hour window without calorie counting reduced intake by about 425 kcal a day, similar to 25% daily calorie restriction, and weight loss did not differ significantly.
- Adding a time window to the same calorie target did not significantly improve weight, body fat or metabolic risk factors in another 12-month trial.
- WHO basics still apply: at least 400 g of fruit and vegetables a day, whole grains, pulses, and limits on free sugars and salt.
- Higher-protein foods increased fullness in tightly controlled studies. That does not automatically carry over to everyday eating or weight.
What can you eat in the window?
Ordinary healthy food, not a free pass. The fasting hours don’t do the work on their own. Timing mostly helps by making it easier to eat less, and it adds little when you eat the same amount.
In a 12-month trial in 90 adults with obesity, eating only between noon and 8 p.m. without calorie counting reduced energy intake by about 425 kcal a day, similar to 25% daily calorie restriction, and weight loss did not differ significantly between the two approaches.Source 1
In a 12-month trial of 139 adults with obesity who all followed the same calorie target, adding an 8 a.m. to 4 p.m. eating window did not significantly improve weight, body fat or metabolic risk factors compared with calorie restriction alone.Source 2
The schedule itself is explained in the 16:8 intermittent fasting guide.
What should each meal include?
Protein, vegetables, whole grains and pulses. You don’t need special fasting foods. Usual healthy-eating guidance fits any window, and a protein source at meals is a practical anchor for fullness.
WHO recommends a varied diet based on minimally processed foods, at least 400 g of fruit and vegetables a day for people older than 10, carbohydrates mainly from whole grains, vegetables, fruit and pulses, free sugars below 10% of energy intake and salt below 5 g a day.Source 3
In tightly controlled studies, higher-protein foods increased fullness ratings more than lower-protein foods; the authors caution that this does not automatically translate into everyday eating or weight outcomes.Source 4
| Part of the diet | Aim or limit | WHO basic |
|---|---|---|
| Overall diet | Aim | Varied and based on minimally processed foods |
| Fruit and vegetables | Aim | At least 400 g a day for people older than 10 |
| Carbohydrates | Aim | Mainly from whole grains, vegetables, fruit and pulses |
| Free sugars | Limit | Below 10% of energy intake |
| Salt | Limit | Below 5 g a day |
| Time | Meal | Why it helps |
|---|---|---|
| 12:00 | Lentil and vegetable salad with wholegrain bread | Protein and fibre to open the window |
| 16:00 | Plain yoghurt with fruit, or a handful of nuts | A planned snack instead of grazing |
| 19:30 | Fish or tofu with vegetables and potatoes or brown rice | A satisfying last meal before the fast |
| All day | Water, plus black coffee or tea if you like | Hydration without energy |
What is worth limiting?
Sugary drinks, sweets, and processed foods high in salt and unhealthy fats. They fit a window as easily as vegetables do, which is why the window on its own is not enough.
Did the trials test a menu?
Mixed evidence
Trials tested timing, not menus
No. The fasting trials compared eating windows and calorie targets. They did not test which foods to choose inside a window, although one taught participants general healthy food choices. Food advice for the window therefore rests on general WHO healthy-diet guidance.Source 1Source 3
Who needs individual advice?
Talk to a qualified health professional before fasting if you are pregnant or breastfeeding, under 18, living with or recovering from an eating disorder, have diabetes, take insulin or a medicine affected by meal timing, are an older adult, or are acutely ill. Do not change the dose or timing of any medicine without your clinician. See Blimbi’s safety guide.
Frequently asked questions
What should I eat during intermittent fasting?
Ordinary healthy food, and the amount still matters. In one 12-month trial the window had no food restrictions, yet people also received general healthy-eating education. Another trial found that timing added little on top of the same calories.Source 1Source 2
Do I need to count calories on intermittent fasting?
Not necessarily. In a 12-month trial, an 8-hour window without calorie counting reduced intake and weight about as much as calorie restriction. Results vary between people and depend on what you eat.Source 1
Can I snack during the eating window?
Yes. A planned snack such as fruit, plain yoghurt or nuts fits WHO healthy-diet basics. Constant grazing tends to blur the structure that makes a window useful.Source 3
Sources
Time-Restricted Eating Without Calorie Counting for Weight Loss in a Racially Diverse Population: A Randomized Controlled TrialShuhao Lin et al. American College of Physicians, July 1, 2023.DOI: 10.7326/M23-0052 · PMID: 37364268Human randomized trial
Calorie Restriction with or without Time-Restricted Eating in Weight LossDeying Liu et al. Massachusetts Medical Society, April 21, 2022.DOI: 10.1056/NEJMoa2114833 · PMID: 35443107Human randomized trial
Healthy dietWorld Health Organization. World Health Organization, January 26, 2026.Official guidance
The Effects of Increased Protein Intake on Fullness: A Meta-Analysis and Its LimitationsJaapna Dhillon et al. Elsevier BV, June 1, 2016.DOI: 10.1016/j.jand.2016.01.003 · PMID: 26947338Systematic review and meta-analysis
Overview – Eating disordersNHS. NHS, January 23, 2024.Official guidance
Fasting Safely with DiabetesMartin M. Grajower. National Institute of Diabetes and Digestive and Kidney Diseases, August 26, 2020.Official guidance