Can a cup of coffee improve your health?

Many people enjoy their daily cup (or more) of coffee. It can have benefits beyond helping people wake up in the morning, though. The Tech Times website lists these positive attributes of moderate caffeine consumption:
• Exercise. A study cited by the International Journal of Sport Nutrition and Exercise Metabolism found that people who drank a caffeinated beverage before exercise burned 15 percent more calories during their workouts than those who took a placebo.
• Eyesight. The chlorogenic acid in coffee contains a strong antioxidant that’s been shown to prevent retinal degeneration in mice. Research suggests it might play a role in helping humans prevent deteriorating vision and blindness.
• Diabetes. A Harvard School of Public Health study found that people who drank an extra cup of coffee a day over four years decreased their risk of a Type 2 diabetes diagnosis by 11 percent.