Summary
Dr. Norman Swan and co-host Tegan Taylor tackle listener questions about the health benefits of apple cider vinegar. Norman provides a deep history of vinegar spanning 10,000 years, from its origins as a food preservative to its use during plague outbreaks in 17th century Ferrara, Italy, where it was used as a surface antiseptic alongside strict infection control protocols. The episode covers the science of vinegar's bioactive compounds, which can support the microbiome by promoting short-chain fatty acid production, provide antimicrobial effects against E. coli and Salmonella, and potentially help with blood sugar regulation. Norman explains that acetic acid and other organic acids in vinegar can penetrate bacterial membranes and burst them open. A key takeaway is that apple cider vinegar may not be anything special compared to other vinegars. Studies show that balsamic vinegar actually ranks higher for beneficial bioactive compounds and antioxidant effects, while apple cider vinegar sits at the lower end of the scale. They also cover the story of Paul Bragg, one of the earliest health influencers who marketed apple cider vinegar as a cure-all while lying about his age to appear younger. The overall verdict: taking vinegar in moderation is probably fine and potentially beneficial, but don't overdo it as excessive amounts can damage tooth enamel and the esophagus.
Key Points
- Vinegar has roughly 10,000 years of history and was used as a surface antiseptic during plague outbreaks in 17th century Italy
- Vinegar's bioactive compounds support the microbiome and promote short-chain fatty acid production with anti-inflammatory effects
- Acetic acid and other organic acids in vinegar kill bacteria like E. coli and Salmonella by bursting their cell membranes
- Some research suggests vinegar may slow blood sugar spikes after meals, though nobody fully understands the mechanism
- Apple cider vinegar actually ranks lower than balsamic vinegar for beneficial bioactive compounds in comparative studies
- Paul Bragg, founder of the Bragg brand, was one of the earliest health influencers promoting ACV as a cure-all
- Too much vinegar can damage tooth enamel and the lower esophagus due to its acidity
- Weight loss claims for ACV exist in studies but are of poor quality and should not be relied upon
Key Moments
Vinegar's antimicrobial mechanism against harmful bacteria
Norman explains how vinegar's bioactive compounds support the microbiome by promoting short-chain fatty acids, and how acetic acid kills bacteria like E. coli and Salmonella by penetrating their membranes and bursting them open.
"The acetic acid and maybe other organic acids in the vinegar, and that's an important part of the story, other organic acids, get into the membrane, the shrink wrap around the bacterium and burst it open, killing the bacterium."
Balsamic vinegar may be more beneficial than apple cider vinegar
Comparative studies show that apple cider vinegar ranks at the lower end of beneficial bioactive compounds, while balsamic vinegar is at the higher end due to containing seed, skin, and flesh of the grape.
"Apple cider vinegar in some of these studies is at the lower end of the scale, whereas balsamic vinegar is up at the higher end of the scale, has more of these so-called beneficial compounds than apple cider vinegar."
Blood sugar control evidence for vinegar
Norman discusses research suggesting vinegar may slow blood sugar spikes after meals, though the mechanism is not well understood. It could involve delayed gastric emptying or improved cellular glucose uptake.
"And nobody really understands why that might be. It may be through a process of emptying out the stomach more quickly. It may be that when you consume vinegar, the cells in your body are more ready to take out glucose from the bloodstream and therefore not stimulate insulin. Nobody knows. But there is a hint from research that it could be good for controlling blood sugar. We were saying before that apple cider vinegar seems to have a very powerful PR team behind it, but you made it sound like other vinegars could actually be better at doing the things that people claim apple cider vinegar does. Yeah, there have been studies which look at the varying effects of vinegar on bacteria and on antioxidant effects, these bioactive compounds. And apple cider vinegar in some of these studies is at the lower end of the scale, whereas balsamic vinegar is up at the higher end of the scale, has more of these so-called beneficial compounds than apple cider vinegar. And industrial vinegar, which is not made the natural way, is at the lowest end of the scale."
The Paul Bragg origin story of apple cider vinegar marketing
Paul Bragg, one of the earliest health influencers, founded the Bragg brand and lied about his age to appear younger. He published a booklet called "Apple Cider Vinegar Miracle Health System" promising weight control, launching the modern ACV wellness trend.
"He told people that he was much older. Oh, that's clever. Yeah, right? Because then you can be like, look- I'm 96, but I look like a 45-year-old."
