Apple Cider Vinegar for Weight Loss: Fact or Fiction?

Apple cider vinegar has been a folk remedy for centuries and a social media favourite for years. Some research supports modest benefits; much of the hype goes far beyond it. Here is what the evidence shows.

What is in apple cider vinegar

ACV is made by fermenting apple juice: yeast turns the sugar into alcohol, then bacteria turn the alcohol into acetic acid. Most ACV is about 5% acetic acid. “Raw” or unfiltered versions contain “the mother”, a cloudy mix of bacteria and yeast, but there is no good evidence that the mother adds benefits for weight.

Blood sugar

This is the strongest area of evidence. Several small studies show that vinegar taken with a carbohydrate-rich meal lowers the rise in blood sugar and insulin afterwards, possibly by slowing stomach emptying and improving glucose uptake into muscle. Meta-analyses find small reductions in fasting glucose and HbA1c in people with type 2 diabetes. It is not a replacement for diabetes treatment, and people on insulin or sulfonylureas should talk to their doctor because it could add to low blood sugar risk. See balancing blood sugar.

Weight loss

• A 2009 Japanese study gave 15 or 30 ml of vinegar daily to adults with obesity for 12 weeks. Both groups lost about 1–2 kg more than placebo and had smaller waists. Weight returned after stopping.
• A 2018 Iranian trial combined ACV with a calorie-restricted diet; the ACV group lost about 2 kg more over 12 weeks.
• A 2024 Lebanese study reported larger effects, but its size and methods have been questioned and it needs replication.

Overall, ACV may help a little, likely through fullness and blood sugar effects, but it is not a strong weight-loss tool.

Side effects

• Tooth enamel erosion: acetic acid weakens enamel. Dilute it, drink through a straw, rinse with water afterwards and do not brush for 30 minutes.
• Throat irritation: never take it straight; there are reports of throat burns.
• Stomach upset and nausea, which may be part of why some people eat less.
• Delayed stomach emptying: a concern for people with gastroparesis, common in long-term diabetes.
• Low potassium with very large amounts over long periods, reported in a case study.

Gummies and pills

ACV gummies are popular, but many contain little acetic acid and several grams of sugar. Tablets vary widely in content. If you want to try ACV, the liquid diluted in water is cheaper and closer to what was studied.

How to use it if you want to try

1. Mix 15 ml (1 tablespoon) in a large glass of water.
2. Drink it with or just before your largest carbohydrate meal.
3. Increase to 30 ml a day if tolerated.
4. Use a straw and rinse your mouth with water afterwards.
5. Give it 8–12 weeks and judge by waist and weight trends.

Using vinegar in salad dressings with olive oil is another easy way to get similar amounts.

Myths to ignore

• “It detoxes your body.” The liver and kidneys handle detoxification; vinegar does not add to it.
• “It alkalises your blood.” Blood pH is tightly controlled and food does not change it meaningfully.
• “It melts belly fat.” No food or drink targets fat in one area.
• “Raw with the mother is much better.” The acetic acid content is what was studied; the mother has not been shown to add weight-loss benefits.

Where it fits

ACV is a small helper at most. A calorie deficit, enough protein and fibre, and daily activity drive results. See fat-loss supplements, fibre for fullness and counting macros.

Frequently asked questions

Photo: Tim Sullivan, StockSnap (public domain).

General information, not medical advice.