About.com has an article that summarizes some of the current studies. There is no long-term, serious study that has dealt with the issue:
Quote:
Perhaps the most intriguing aspect of apple cider vinegar’s possible health benefits is its effect on blood glucose levels. Several small studies suggest that vinegar (both apple cider vinegar and other types) may help to lower glucose levels.
For example, a preliminary study by researchers at Arizona State University, published in the journal Diabetes Care, examined people with type 2 diabetes. Study participants took either two tablespoons of apple cider vinegar or water with one ounce of cheese at bedtime for two days. The researchers found taking two tablespoons of apple cider vinegar at bedtime had a favorable impact on blood glucose levels the next morning. Prior to the study, the average fasting blood glucose level was 137 mg/dL. It decreased by 2% with the cheese and by 4% with the vinegar, a statistically significant difference. In people with a fasting glucose level above 130 mg/dL prior to the study, the vinegar reduced glucose levels by as much as 6%. The study was very small and the duration was short, so more research is needed.
Other studies have found that vinegar can lower the post-meal rise in glucose. The acetic acid in vinegar is thought to slow starch digestion and reduce the glycemic index of starchy foods. For example, a small study compared the effect of vinegar with white bread on blood glucose and insulin levels. Researchers found that those who took vinegar with white bread had lower post-meal blood glucose and insulin levels and it also appeared to increase satiety ratings.
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If it does have an effect, it's very small. A 4% decrease with cheese and a 6% decrease with vinegar! I imagine doing nothing would result in close to a 4% decrease, too. So we're talking about a 1% or 2% drop.
apple cider vinegar
