NR 228 Week 7 Apple Cider Vinegar Myth Analysis Example

Food Myth Analysis: "Two Tablespoons of Apple Cider Vinegar Before Meals and the Fat Just Melts Off," Tested Against Two Studies

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College of Nursing, Chamberlain University

NR 228: Nutrition, Health & Wellness

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Month Day, Year

Food Myth Analysis: "Two Tablespoons of Apple Cider Vinegar Before Meals and the Fat Just Melts Off," Tested Against Two Studies

The Claim, Quoted

The claim came in a text message from my aunt, forwarded from a friend, with a video link attached: "Two tablespoons of apple cider vinegar before meals and the fat just melts off. I've lost 6 pounds in 2 weeks!!" My aunt is 56, has been told by her doctor that her blood sugar is in the prediabetes range, and has bought a large bottle of apple cider vinegar and a jar of vinegar gummies. She asked me, as "the nurse in the family," whether it works. I have quoted the claim exactly as she sent it, because improving it into something more testable would be analyzing a different claim.

What Would Have to Be Measured

Before any study can answer it, the claim has to mean something testable. "The fat just melts off" could mean that vinegar causes weight loss by itself, that it causes loss of body fat specifically, or that it helps people eat less. "Six pounds in two weeks" is one person's experience, which could come from vinegar, from eating less because vinegar before meals is unpleasant, from water loss, or from other changes made at the same time. To test the claim, a study would need to compare people who take vinegar with people who take something that looks and tastes similar but contains none, randomly assigned, for long enough to measure fat rather than water, with body weight and body fat measured the same way in both groups. The honest version of the question is: do people who take vinegar lose more weight or fat than similar people who do not, over months rather than days?

It is also worth separating the claim into what it says about vinegar and what it says about her. Even if vinegar had a modest effect in a trial, her own result could have many causes. She told me that since starting the vinegar she has also stopped having dessert, because she did not want to "undo" the vinegar, and that she drinks it before dinner, which makes her less hungry for a while. Both of those could produce weight loss on their own. Her experience is real, but it cannot tell us which of the changes caused it; only a comparison group can do that.

Weighing the Studies

The study most often behind this claim is by Kondo et al. (2009). Obese Japanese adults were randomly assigned to drink 500 mL a day of a beverage containing 15 mL of vinegar, 30 mL of vinegar, or no vinegar, in a double-blind design, for 12 weeks. At the end, body weight, body mass index, visceral fat, waist circumference and triglycerides were significantly lower in both vinegar groups than in the placebo group. That is a real, randomized result, and it is the strongest point in the claim's favor.

Several things limit what it shows. The participants were obese Japanese adults, not a 56-year-old American woman. The vinegar was diluted in a large drink, not taken as a shot or a gummy. The trial lasted 12 weeks, and the differences it found in weight were modest; the authors' own conclusion is that vinegar "might be useful" for preventing metabolic syndrome, not that fat melts off. And the first author's listed contact address is at a vinegar manufacturer, which does not make the result wrong but is a reason to want independent confirmation.

The second source is a systematic review by Launholt et al. (2020), which identified 13 human studies and 12 animal studies of apple vinegar. It concluded that there may be some beneficial effects and that side effects seem minor when it is taken in recommended amounts and ways, but that because of the lack of high-quality research, the evidence is insufficient to support firm conclusions. A review of thirteen small studies that reaches "insufficient evidence" outweighs any single enthusiastic video, and it also outweighs a single positive trial, because it looks at all of them together.

Counting sources would give the wrong answer here. The internet contains hundreds of pages repeating the claim and a few studies testing it. The number of pages says nothing about the evidence; the quality and number of trials does.

The Part That Is True

The claim is not entirely false. There is some randomized evidence that daily vinegar, diluted in a drink, is associated with a small reduction in weight over three months, and the review does not rule out benefit. What is false is the size and the mechanism implied by "the fat just melts off." Nothing in these studies suggests large or rapid fat loss, and my aunt's six pounds in two weeks is far more likely to reflect eating less, other changes, or water than vinegar dissolving fat.

There is also a safety point the claim leaves out. Vinegar is acidic. Drunk undiluted, it can irritate the throat and wear tooth enamel, and the review's reassurance about side effects applies to recommended amounts taken in recommended ways, such as diluted in water. Gummies add sugar, which is not what someone with prediabetes needs.

Talking to Somebody Who Already Bought It

My aunt has already spent money and has told her friends it works. Telling her she was fooled would end the conversation and probably not change what she does. What I said, by phone, was: "There's a real study where people who drank diluted vinegar every day for three months lost a little more weight than people who didn't. It wasn't a lot, and it wasn't fast. If you like it, dilute it in a big glass of water and use a straw, because it's hard on your teeth. But the six pounds is probably the smaller portions you told me about, and that's the part I'd keep doing."

I also asked her to skip the gummies because of the added sugar, and to mention the vinegar to her doctor at her next visit, since her doctor is managing her prediabetes and may have a plan that works better than either. She agreed to the straw and the water. She did not agree to give up the gummies, and I left that for another day. Changing one part of a habit someone is proud of is more realistic than changing all of it in one call.

References

Kondo, T., Kishi, M., Fushimi, T., Ugajin, S., & Kaga, T. (2009). Vinegar intake reduces body weight, body fat mass, and serum triglyceride levels in obese Japanese subjects. Bioscience, Biotechnology, and Biochemistry, 73(8), 1837-1843. https://doi.org/10.1271/bbb.90231

Launholt, T. L., Kristiansen, C. B., & Hjorth, P. (2020). Safety and side effects of apple vinegar intake and its effect on metabolic parameters and body weight: A systematic review. European Journal of Nutrition, 59(6), 2273-2289. https://doi.org/10.1007/s00394-020-02214-3