A recent article in The Lancet shows an inverse association between coffee consumption and risk of Type 2 diabetes. This epidemiological study in Dutch population shows that those who drank 7 or more cups of coffee a day were 50% less likely to develop Type 2 diabetes compared to those who drank two cups a day or less.
While caffeine is known to reduce sensitivity to insulin, other constituents of coffee such as chlorogenic acid and magnesium could offer some health benefits. However, before coffee could be strongly advocated, there is a need to assess possible adverse effects of coffee on other health aspects such as high intake of coffee may raise cholesterol levels and increase the risk of osteoporosis, or brittle bone disease, in some people.