Joel Fuhrman, M.D.
Mysterious protective effects of coffee against diabetes have been reported in the past. A 2010 meta-analysis analyzing data from 18 studies reported that each additional cup of coffee consumed per day was associated with a 7% reduction in risk of diabetes.1 This was surprising, especially because coffee consumption has been shown to raise glucose levels after a meal so you would expect it to worsen diabetes, not help it. However, this is true of both decaffeinated and regular coffee, although regular coffee raises blood glucose more than decaf.2
The reason for the decreased diabetes risk remains uncertain, but since coffee comes from a darkly colored bean, it is likely that antioxidants, minerals, or other phytochemicals present in coffee may be responsible for the long term benefits seen in the observational studies.3 With this in mind, we must also remember that almost all of the subjects in the observational studies were eating the standard American diet and therefore starving for antioxidants and phytochemicals.
Is the standard American diet so nutrient-poor that a significant portion of people’s phytochemical intake comes from their morning coffee? Read more...
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