Apple Cider Vinegar for Weight Loss

Published on: May 29, 2026

Medically reviewed by

Ashis Tandukar

Superintendent Pharmacist · Reg: GPhC No. 2084170

You've probably seen the morning routine: a tablespoon of apple cider vinegar in a glass of warm water, swallowed before breakfast, promising to melt away fat. It shows up on TikTok, in wellness columns, in the gummies stacked by the supermarket checkout. And if you've ever stood in your kitchen wondering whether it's worth the wince, you're in good company — it's one of the most googled weight loss questions in the UK.

So let's be straight with each other about what apple cider vinegar can and can't do.

What apple cider vinegar actually is

Apple cider vinegar is what you get when crushed apples are fermented twice — first into alcohol, then into vinegar. That second fermentation is where acetic acid comes from, and acetic acid is the compound everyone's really talking about when they credit vinegar with health benefits. Most cider vinegars sit at around 5% acetic acid.

The cloudy strands you see floating in the unfiltered bottles are called "the mother" — a mix of yeast and bacteria left over from fermentation. It's often described as the magic ingredient. In reality, there's no good evidence the mother does anything special for your waistline, though it's harmless enough.

It's an ancient remedy. People have used vinegar for strength, for cleaning wounds, even as a scurvy treatment, for thousands of years. Weight loss is one of the newest claims pinned to it — and one of the shakiest.

Does apple cider vinegar help you lose weight?

Here's the honest answer: a little, maybe, for some people — but nothing like the dramatic results the internet promises.

The study everyone cites is a Japanese trial from 2009. Around 175 people drank a daily drink containing no vinegar, one tablespoon, or two tablespoons, for twelve weeks. Those taking vinegar lost a modest amount — somewhere in the region of one to two kilograms — and had slightly lower triglyceride levels than the no-vinegar group. Useful to know, but a couple of kilos over three months is the kind of result that's easily wiped out by a few relaxed weekends.

A 2018 trial added a little more. Thirty-nine people followed a reduced-calorie diet, half of them adding apple cider vinegar. Both groups lost weight; the vinegar group lost a bit more. The catch, as with almost every vinegar study, is that it was small, short, and ran alongside calorie restriction — so the diet was doing the heavy lifting.

You may also have seen headlines in 2024 about a study suggesting much bigger losses in young people. It's worth knowing that independent experts raised serious questions about that study's methods and unusually large results, and the journal that published it issued a formal expression of concern. So it's not one to hang your hopes on.

Pull all of it together and the picture is consistent: vinegar is not a reliable way to lose meaningful weight, and certainly not on its own. Most of the apparent benefit comes from eating fewer calories — sometimes because the vinegar makes you feel slightly sick, which is hardly the goal.

How apple cider vinegar might work

There are a few plausible mechanisms, and it helps to understand them so you can judge the claims for yourself.

The most studied is blood sugar. Acetic acid appears to slow the rate at which starchy carbohydrates are broken down and absorbed in the gut. Taken before a carb-heavy meal, vinegar can blunt the post-meal blood sugar spike, which has been shown fairly consistently in people with prediabetes and type 2 diabetes. Steadier blood sugar can mean fewer energy crashes and, in theory, less snacking — but the effect on actual weight is small.

Then there's appetite. Some research suggests vinegar makes people feel fuller for a bit longer after eating. The uncomfortable footnote is that at least one study found this fullness came largely from mild nausea. Feeling too queasy to finish your plate isn't a sustainable appetite strategy, and it's worth being honest that some of vinegar's "appetite suppression" is really just a slightly upset stomach.

What apple cider vinegar almost certainly does not do is "burn fat", "detox" your system, or target belly fat specifically. No food or drink does that. If something is being sold to you as a fat-burner, that's your cue for healthy scepticism.

Does apple cider vinegar burn belly fat?

This is one of the most common things people search for, so it deserves a direct answer: no, apple cider vinegar does not specifically target belly fat. Nothing does.

The idea of "spot reduction" — losing fat from one chosen area by eating or doing a particular thing — is one of the most persistent myths in weight loss. Your body decides where it stores and releases fat based largely on genetics and hormones, not on what you sip before breakfast. When people do lose belly fat, it's because they've lost fat overall and some of it happened to come from the middle.

A 2009 study did note slightly smaller waist measurements in the vinegar group, but that tracked with the small overall weight loss — it wasn't vinegar magically dissolving abdominal fat. If a product promises to melt fat from a specific area, that promise is the problem.

How to take apple cider vinegar for weight loss

If you've read the evidence and still fancy trying it — perhaps for the blood sugar steadying rather than the weight loss — here's how to do it without harming yourself.

The usual amount in studies is one to two teaspoons (and at most one tablespoon) per day. More is not better; it just raises the risk of side effects.

Always dilute it. Mix it into a large glass of water, never sip it neat. Undiluted vinegar is acidic enough to damage tooth enamel and irritate the lining of your throat and gut.

On timing, most people who use it take it shortly before a meal, particularly a meal with carbohydrates, since that's when the blood-sugar effect is most relevant. If you're wondering about the best time to drink apple cider vinegar for weight loss, before your largest carb-containing meal is the sensible answer — but there's no magic window, and taking it on a completely empty stomach can make nausea worse for some people.

A few small habits make it gentler: drink it through a straw to protect your teeth, rinse your mouth with plain water afterwards, and don't brush your teeth straight away, as enamel is softer right after acid exposure. Start with a smaller amount to see how your stomach tolerates it.

What about apple cider vinegar gummies and tablets?

Gummies are everywhere now, marketed as an easier, tastier way to get the benefits without the sour hit. The problem is twofold.

First, gummies often contain only a small amount of actual acetic acid — sometimes a fraction of what was used in the studies — alongside added sugar to make them palatable. Sugar in a weight loss supplement is a contradiction worth noticing.

Second, supplements aren't regulated as tightly as medicines, so what's on the label isn't guaranteed to match what's in the pot. Tablets have the same issue. If the question is "do apple cider vinegar gummies work for weight loss", the honest answer is that there's even less evidence for the gummies than for the liquid — and the liquid evidence was already weak.

If you genuinely want to try apple cider vinegar, the plain diluted liquid is cheaper and at least matches what was tested. But none of these products are a shortcut.

The risks and who should be careful

Apple cider vinegar gets treated as harmless because it's "natural", but a few people should be genuinely cautious.

Your teeth take the first hit. Repeated acid exposure erodes enamel, and that damage doesn't grow back. Reflux and indigestion can worsen too, especially if you already get heartburn.

Vinegar has been reported to lower potassium levels. That matters if you take diuretics ("water tablets") for high blood pressure, which can also lower potassium — the two together can push levels too low. It can also affect insulin and blood sugar, so if you have diabetes, particularly if you're on insulin or other glucose-lowering medication, talk to your GP or pharmacist before making it a daily habit. The same goes if you have gastroparesis or any condition that slows stomach emptying, since vinegar can slow it further.

If you're pregnant or breastfeeding, there's simply not enough safety data to recommend it, so it's best left alone.

How it compares to treatments that actually shift the scale

Honesty matters most here. People rarely reach for apple cider vinegar because they're curious about acetic acid — they reach for it because they're frustrated, they've tried everything, and they want something that works.

So it's only fair to put the numbers side by side. The best vinegar studies show around one to two kilograms over three months, mostly riding on calorie restriction. By contrast, the GLP-1 medications now prescribed for weight loss — semaglutide and tirzepatide — produce average losses of roughly 15% to 20% of body weight over a year or more in clinical trials, by genuinely reducing appetite and quietening the constant background "food noise" many people live with.

That's not a fair fight, and it's not meant to be a dig at anyone who's tried the vinegar route. It's just the difference between a kitchen-cupboard remedy with a sliver of evidence and a regulated medicine with large, repeated trials behind it. If you're curious about the natural alternatives that get hyped online, we've looked honestly at berberine, the so-called "nature's Ozempic" and the pink salt trick too — and the pattern is much the same.

None of this means food and habits don't matter. They matter enormously. But if you've been relying on remedies like vinegar to do something they were never capable of, it might be worth finding out what's actually available to you.

Where apple cider vinegar does fit

None of this is to say you should pour your vinegar down the sink. As part of a meal — splashed on chips, whisked into a salad dressing, used in cooking — it's a perfectly good, low-calorie way to add flavour, and the small blood-sugar steadying effect is a genuine, if minor, bonus. There's a real difference between using vinegar as a tasty ingredient and treating it as a weight loss treatment.

If you want to understand the broader picture of what does and doesn't help, our guides to supplements for weight loss and appetite suppressants that actually work go into more detail. And if you're weighing up medical options, our overview of weight loss medication in the UK is a good place to start.

This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before starting any treatment.