
There are relationships between coffee drinking and the risks of dying from heart disease, cancer, or any cause in almost 42,000 men who participated in the Health Professionals Follow-Up Study and more than 84,000 women who had participated in the Nurses' Health Study. At the study start, all participants were free of heart disease and cancer.

The researchers found that women who drank two or three cups of caffeinated coffee daily had a 25 % lower risk of death from heart disease during the follow-up than non-drinkers. Women also had an 18 % lower death risk from a cause other than cancer or heart disease compared with non-coffee drinkers. While for men, drinking two to three cups of caffeinated coffee daily has no effect either an increased or a decreased risk of death during the follow up.

More recently, research has found coffee drinking linked with a lower risk of type 2 diabetes and some cancers, and preventing the development of cardiovascular disease. It because people may have under- or over-reported their coffee consumption, for instance.
I would tell them to weigh the subjective risk of their coffee consumption. For instance, if they love coffee, but it makes them jittery, and they can't sleep, they need to adjust it. Look at your symptoms, if decaf is no problem, I wouldn't put a limit on that.
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