Heavy coffee consumption is linked to higher death risk according to new research, and for one age group -- it's an even greater threat.

FOX News Radio's Bill Vitka reports:

With that fourth cup of coffee you may be brewing up trouble. A new study is raising a red flag for people who drink more than 28 cups of joe a week.

The Mayo Clinic says that level of consumption is linked to a 21% greater mortality rate in men and women of all ages. And if you under 55 -- it jumps to a 50% higher mortality rate.

The study doesn't identify coffee as the cause of death, but it is associated with an increased risk of death.

The research doesn't erase coffee's health benefits, but suggests there's more to know about the complex blend of caffeine and other chemicals on our bodies at high doses.

Bill Vitka, FOX News Radio.