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Should you cut back on coffee?

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Rob van Dam, PhD, adjunct assistant professor of nutrition at Harvard School of Public Health

• For most of us, java isn't harmful.
It's true that caffeine may raise blood pressure, so if you have hypertension, it's smart to switch to decaf. Caffeine can also interfere with sleep; if you suspect it's causing you to toss and turn, cut back. Otherwise, there is no health reason to stop drinking it. 12 surprising sources of caffeine

• It may lower your risk of becoming diabetic.
Every cup of coffee you drink seems to reduce your risk of the disease. In fact, a review of research in Archives of Internal Medicine found that after three or four cups a day, you see a 25 % lower risk. Other research shows that decaf may also cut your risk of diabetes, which suggests that it's not the caffeine but something else in coffee, possibly an antioxidant called chlorogenic acid, that's responsible. Coffee drinkers may also be less likely to develop cirrhosis of the liver and liver cancer.

• Caffeine may have its own benefits.
It could reduce your risk of Parkinson's disease and possibly even Alzheimer's. That's not a reason to start consuming it, but it's good news if you already enjoy a cup of joe. Big health benefits of coffee

James D. Lane, PhD, director of the Duke University Medical Center Psychophysiology Laboratory

• The research on coffee's perks is weak.
The main problem is that many studies compare coffee drinkers with people who don't drink coffee. Coffee drinkers may have something else in common that's the true cause of these benefits. Just because two things are correlated doesn't mean that one causes the other. 25 diet-busting foods you should never eat

• It can make health conditions worse.
The caffeine in coffee does have negative effects, especially for people with high blood pressure or diabetes. In one study, hypertensives' blood pressure came down a bit after they quit coffee for a week. In another study, we found that giving diabetic patients caffeine before giving them a glucose tolerance test made their blood sugar rise higher than when they didn't have caffeine. In other words, for people who already have diabetes, it appears to make the condition worse. Decaf, however, is fine.

• Your brew can aggravate stress.
My studies have shown that adrenaline responses to stress are higher if you've had caffeine than if you haven't—it may make you more tense, anxious, and jittery, in addition to giving you sleep problems. Coffee may affect joint pain

Our advice:
If you don't have diabetes or high blood pressure, a coffee habit probably doesn't hurt—and may even help your health. While research suggests that some people are more sensitive to caffeine than others, there's no need to cut back unless you suffer from anxiety or insomnia, in which case you may want to switch to decaf.

If you don't drink coffee, there's no reason to start: Adding fruits, vegetables, and whole grains to your diet is a surer way to reduce disease risk.


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