stress??

Caffeine can exaggerate the effects of stress.

Lane's research has found that caffeine can amplify stress in people who consume it every day. In a small study of habitual coffee drinkers, he found that caffeine amplifies the stress response in the body, resulting in increases in blood pressure and heart rate, as well as increases in the production of stress hormones.

Caffeine directly affects not only the way a person's body responds to stress but also the mind by magnifying an individual's perception of stress.

An exaggerated stress response can make a difference to people with conditions such as high blood pressure and type 2 diabetes, Lane said.

In fact, he encourages people with these conditions, as well as people with prediabetes or borderline hypertension who are not yet on medication, to try eliminating coffee and other caffeinated beverages to see if it lowers their blood pressure or blood sugar levels.

Lane said lower blood pressure readings may occur within a few days of quitting caffeine, but it may take several months for people to see reductions in blood glucose.