Daily consumption of caffeine in coffee, tea or soft drinks increases blood sugar levels for people with type 2 diabetes, research suggests.
Caffeine pills equivalent to four cups of coffee a day increased blood sugar levels by 8% over the day, US researchers report in Diabetes Care. Cutting caffeine out of the diet may help diabetics control their blood sugar levels, the team said. But UK experts said more research was needed before advice could be given.
The ten people who took part in the study were monitored with a tiny glucose monitor embedded under the skin. The device meant that the researchers could track the effects of caffeine over 72-hours as the patients with type 2 diabetes went about their normal lives.
Previous studies had shown that caffeine increases the body's resistance to insulin, the hormone responsible for managing the response to glucose levels in the blood.
But in healthy people this is not really a problem, said study leader Dr James Lane from Duke University Medical School.
In the diabetic patients, who took caffeine pills on one day and a placebo the next, caffeine caused blood sugar levels to rise.
The effect was particularly strong after meals with a rise of 9% after breakfast, 15% after lunch and 26% after dinner.
Source - BBC