A major paradox exists between the long-term and short-term effects of coffee.
Short-term studies have linked caffeine and coffee consumption with increased blood sugar levels and insulin resistance.
A recent study showed that a single serving of coffee, containing 100 mg of caffeine, can negatively affect blood sugar control in healthy but overweight men.
Other short-term studies — both in healthy individuals and in type 2 diabetics — show that consuming caffeinated coffee impaired blood sugar regulation and insulin sensitivity after meals.
This does not happen with decaf coffee, which suggests that
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