Caffeine is a common stimulant found in coffee, tea, and many other beverages. While caffeine can help increase alertness and reduce feelings of fatigue, consuming too much caffeine, especially in the morning after waking up, can negatively affect blood sugar stability.
A study from the World Health Organization found that caffeine can increase blood sugar levels immediately after consumption. Caffeine stimulates the adrenal glands to produce adrenaline, a hormone that causes a temporary increase in blood sugar. This can lead to a state of “reactive hyperglycemia,” especially if the body has not eaten breakfast or has not been fully replenished after a long sleep.
Drinking coffee can cause a slight increase in blood sugar levels in healthy people, but this effect is more pronounced in people with type 2 diabetes. This may explain why people with diabetes need to be more careful about consuming caffeine in the morning.
Additionally, studies show that the morning is a sensitive time for blood sugar, as the body after a long night of “fasting” will react strongly to anything that stimulates blood sugar, including caffeine. When you drink coffee in the morning, your insulin levels may drop, making it harder for your body to control blood sugar levels.
To maintain stable blood sugar levels and avoid the negative effects of caffeine, experts recommend controlling the amount of caffeine consumed throughout the day, especially in the morning. A study from the American Heart Association recommends that consuming up to 400 mg of caffeine per day (equivalent to about 4 cups of coffee) is safe for most adults, but morning caffeine intake should be reduced to avoid unwanted blood sugar spikes.
