Health Reasons to Drink Coffee (and Cons to Consider)

Health Benefit 2. Defeating Diabetes
Studies link frequent coffee consumption (4 cups per day or more) with a lowered risk of developing type 2 diabetes. Scientists suspect that antioxidant compounds in coffee-cholorogenic acid and quinides-may boost cells' sensitivity to insulin, which helps regulate blood sugar. While most of the research didn't assess whether the brews were caffeinated, decaf may be even better, since other studies have found that caffeine tends to blunt the insulin-sensitivity boost.

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Health Benefit 3. Hearty Benefits
Some studies show that moderate coffee drinkers (1 to 3 cups/day) have lower rates of stroke than non-coffee-drinkers; coffee's antioxidants may help quell inflammation's damaging effects on arteries. Some researchers speculate that the compounds might boost activation of nitric oxide, a substance that widens blood vessels (lowering blood pressure). More java isn't better: a 5-cup or more daily habit is associated with higher heart disease risks. Researchers ­believe excessive caffeine may sabotage the antioxidants' effects.

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Health Benefit 4. Liver Lover
Though the research is limited at best, it appears that the more coffee people drink, the lower their incidence of cirrhosis and other liver diseases. One analysis of nine studies found that every 2-cup increase in daily coffee intake was associated with a 43 percent lower risk of liver cancer. Possible explanation: caffeine and antioxidant chlorogenic and caffeic acids in coffee might prevent liver inflammation and inhibit cancer cells.

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Health Con 1. Java Jones
If you're sensitive to caffeine, it can cause irritability or anxiety in high doses (and what's "high" varies from person to person). How? Chemically, caffeine looks a lot like adenosine, a "slow-down" brain chemical associated with sleep and relaxation of blood vessels. Caffeine binds to adenosine receptors on nerve cells, leaving no room for adenosine to get in-so nerve cell activity speeds up, blood vessels constrict-and you get a caffeine buzz (or irritable jitters). Of course, if you caffeinate yourself daily, you'll likely develop tolerance to its effects and the jitters will subside. But that also means that eventually you'll need a regular caffeine fix just to reach your baseline level of alertness. And your body will adapt by producing more adenosine receptors, making you more sensitive to the effects of adenosine.

Health Con 2. A Sleep-Stealer
If you're having trouble sleeping it might help to cut down on caffeinated coffee, or to drink it only early in the day. Generally it takes about 6 hours for the caffeine to clear your system, although it varies from person to person. The sleep-robbing effects may worsen as we age, too, a recent study suggests.

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Health Con 3. Cholesterol Caution
Boiled or unfiltered coffee (such as that made with a French press, or Turkish-style coffee) contains higher levels of cafestol, a compound that can increase blood levels of LDL ("bad") cholesterol. Choose filtered methods instead, such as a drip coffee maker.

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