Some people can’t enjoy caffeine without experiencing negative side effects. Learn about caffeine sensitivity risk factors, plus buzzy alternatives to consider.

Dear Doctors: Have you ever encountered anyone who barely seems to metabolize caffeine at all? I am a 64-year-old woman, and over the last eight years, I have become increasingly unable to tolerate ...

DEAR DOCTORS: Have you ever encountered anyone who barely seems to metabolize caffeine at all? I am a 64-year-old woman, and over the last eight years, I have become increasingly unable to tolerate ...

They may last up to 9 days on average. And because caffeine binds to adenosine receptors (which also modulate pain) quitting caffeine may temporarily increase your perception and sensitivity to pain ...

I have never felt the effects of caffeine. I can drink coffee at 10 o’clock at night and promptly fall asleep. Following the suggestion of a caffeine researcher, I once spent a month drinking nothing ...

Coffee offers more caffeine and a faster boost in energy, but can cause jitters and crashes.Chai has less caffeine and provides L-theanine for a steadier rise in energy.Consider timing and ways to ...

What is the first thing you do every morning when you wake up? If you said brush your teeth or get dressed, you are wrong. The only correct answer is to get a cup of coffee to kick-start your day, and ...

Is tea safe for kids? Read our essential guide on tea for kids covering safety, caffeine risks, and the best herbal options for your little ones.

When I finally confronted my dependency and gave up coffee three months ago, my body wasn’t happy. In the mornings during the time that I would normally have my espresso, my thoughts tried to bargain ...

In one study, researchers found that coffee drinkers between the ages of 65 and 70 required 33% more time to metabolize the same amount of caffeine as the younger participants. Considering your age ...