Does the NHS recommend intermittent fasting?

No. The NHS does not publish a recommendation for or against intermittent fasting, and there is no official NHS fasting diet or NHS 16:8 plan. NHS guidance focuses on the Eatwell Guide, which describes what a balanced diet contains rather than when to eat it. Some NHS-affiliated resources note that fasting may help certain people with weight and blood glucose but that long-term safety data is limited.

Who should not do intermittent fasting?

People with a current or past eating disorder, pregnant or breastfeeding women, people with type 1 or type 2 diabetes (especially on insulin or sulfonylureas), anyone taking medication that must be taken with food, under-18s, and people who are underweight or recovering from illness should not fast without medical advice.

Can I follow the Eatwell Guide and intermittent fasting at the same time?

Yes. The Eatwell Guide is about composition and intermittent fasting is about timing, so they are compatible. The challenge is that you have fewer meals to reach the same targets: at least 5 portions of fruit and veg, wholegrain starchy foods, protein at each meal, two portions of fish a week including one oily, and 6 to 8 glasses of fluid a day.

Does intermittent fasting work better than normal calorie restriction?

Pooled research consistently finds that intermittent fasting produces weight loss comparable to continuous calorie restriction, not clearly better. Where one outperforms the other it is usually down to adherence. The practical question is which pattern you can still follow in six months.

Should I fast during Ramadan if I take medication?

Speak to your GP or pharmacist before Ramadan. NHS trusts publish specific safe-fasting guidance for Ramadan, and medication timings can often be adjusted. This is especially important if you have diabetes, are pregnant, or manage a long-term condition.

UK / NHS-aligned

Intermittent Fasting and the NHS: What UK Guidance Actually Says

Q: Is intermittent fasting healthy?

For a healthy adult with no contraindications, eating within an 8 to 10 hour window is not inherently harmful. Whether it is healthy depends on what you eat during that window. Most reported benefits come from eating less overall rather than from the fasting itself. If restricting your window leads to binge eating, it is the wrong approach for you.

📅 Updated 26 July 2026⏱ 9 min read

If you searched "NHS fasting" or "is intermittent fasting healthy NHS", you were probably looking for an official verdict. Here is the honest answer: the NHS does not publish a recommendation for or against intermittent fasting. There is no NHS 16:8 plan and no NHS fasting diet. What the NHS does publish is the Eatwell Guide — a description of what a balanced diet contains, not when to eat it.

That distinction is the whole point of this page. Intermittent fasting is a timing strategy. The Eatwell Guide is a composition standard. They are not in competition, and you can follow one while ignoring the other — which is exactly where most people go wrong.

What the NHS actually says

Across NHS and NHS-affiliated resources, the consistent position is roughly this:

Weight change comes from a sustained calorie deficit. The eating pattern that gets you there matters less than whether you can keep it up.
Fasting approaches may help some people with weight and blood glucose control, but long-term safety data is limited, particularly for people with diabetes.
If you fast, the risks to manage are nutritional deficiencies, dehydration, and overeating on non-fasting days.
If you take medication, tell your GP practice before changing your eating pattern. Timing of some medicines is tied to meals.
If you choose a plan, prefer one built on balanced eating and written by a registered dietitian.

You will notice there is no endorsement in there — and no prohibition either. Anyone selling you an "NHS-approved fasting protocol" is inventing the approval.

Is intermittent fasting healthy?

For a healthy adult with no contraindications, skipping breakfast and eating within an 8-to-10-hour window is not inherently dangerous. It is a schedule, not a drug.

Whether it is healthy depends almost entirely on what goes into the eating window. A 16:8 day made of takeaway and energy drinks is worse than a three-meal day built on the Eatwell Guide. The fasting window did not make it healthy; the food did or didn't.

The measurable benefits people report — lower calorie intake, fewer late-night snacks, simpler days — mostly come from eating less overall, which a shorter window makes easier for some people and harder for others. If restricting your window makes you binge at 8pm, it is the wrong tool for you, and that is a legitimate finding rather than a personal failure.

Who should not try intermittent fasting

This is the part worth reading twice. Do not start a fasting pattern without medical advice if you:

have or have had an eating disorder, or a difficult relationship with food;
are pregnant or breastfeeding;
have type 1 or type 2 diabetes, especially on insulin or sulfonylureas — fasting can cause hypoglycaemia;
take medication that must be taken with food;
are under 18 or over 65 without supervision;
are underweight, recovering from illness or surgery, or have a history of low blood pressure or fainting.

If none of these apply and you still feel dizzy, cold, irritable or unable to concentrate on fasting days, that is a signal to stop — not to push through.

Running 16:8 without breaking the Eatwell Guide

This is the practical value of this page. The Eatwell Guide targets do not disappear because you compressed your eating window — you just have fewer meals to hit them in. The main NHS reference points, and how to fit them into roughly two meals plus a snack:

Fruit and vegetables: just over a third of what you eat, at least 5 portions a day. In an 8-hour window this means roughly 2–3 portions per meal. Practically: a large handful of veg with lunch, two with dinner, one piece of fruit as the snack.
Starchy foods: just over a third, choosing wholegrain where possible. Brown rice, wholewheat pasta, potatoes with skins on. Cutting carbs and cutting your window is where most people run out of energy by week two.
Protein at every meal. Beans, pulses, fish, eggs and lean meat. Aim for at least 2 portions of fish a week, one of them oily (salmon, sardines, mackerel).
Dairy or fortified alternatives for calcium — easy to lose when you drop a meal.
Unsaturated oils in small amounts — olive and rapeseed rather than butter or ghee.
6 to 8 glasses of fluid a day. Water, tea and coffee count. Fasting does not mean not drinking; dehydration is the most common cause of "fasting headaches". Cap fruit juice and smoothies at 150ml combined.

As a reference point, the NHS uses roughly 2,000 kcal a day for women and 2,500 for men as an average. If you want your own figure rather than the average, our BMR calculator and daily calorie calculator work it out from your body and activity level.

A realistic UK 16:8 day

Window 12:00–20:00. Nothing exotic, nothing imported.

Break the fast (12:00): jacket potato with tinned tuna and sweetcorn, side salad. Or wholemeal wrap with chicken, hummus and a big pile of salad.
Snack (16:00): plain yoghurt with a banana, or an apple with a small handful of nuts.
Dinner (19:00): baked salmon, new potatoes, broccoli and carrots. Or a lentil and vegetable curry with brown rice.
Throughout: water, tea, black coffee. Milk in tea does not meaningfully break a fast for weight purposes.

That day hits 5 A Day, includes oily fish, keeps wholegrains in, and lands in a moderate deficit for most people — without any product you have to buy.

What the research actually shows

Pooled reviews of intermittent fasting keep arriving at the same conclusion: fasting protocols produce weight loss comparable to continuous calorie restriction, not better than it. Where one beats the other, it is usually because participants stuck to it more consistently.

That is a genuinely useful finding. It means the question is not "is fasting superior?" but "which pattern will you still be doing in six months?" For some people that is 16:8. For others it is three meals and no snacking. Both are legitimate answers.

We go deeper into the pooled evidence in our review of the Cochrane-style evidence on intermittent fasting, and the practical set-up in the 16:8 beginner guide for the UK.

Fasting during Ramadan

Religious fasting is a different situation from a weight-loss window, and NHS trusts publish specific Ramadan guidance for this reason. If you have diabetes, take regular medication, are pregnant, or are managing a long-term condition, speak to your GP or pharmacist before Ramadan so timings can be adjusted. Most practices are used to this conversation and will plan around it.

If you train while fasting

Resistance training on an empty stomach is workable but protein timing gets tighter — you have fewer hours to reach your daily total. A simple rule: put your session near the start or end of your eating window so there is a meal on at least one side of it. Our intermittent fasting and exercise guide covers training windows, protein distribution and performance in more detail.

The bottom line

There is no NHS fasting diet to follow. There is NHS guidance on what a balanced diet looks like, and there is a timing strategy called intermittent fasting that is neither endorsed nor forbidden. Use the Eatwell Guide to decide what is on the plate; use the fasting window only if compressing when you eat genuinely makes your week easier. If it doesn't, you have lost nothing by skipping it.