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The result: On the days the patients took caffeine, their blood-sugar levels were 8% higher. And after every meal -- including dinner -- their blood sugar spiked higher than it did on the day they had no caffeine. These are clinically significant blood-sugar elevations due to caffeine, Lane tells WebMD. Caffeine increases blood glucose by as much as oral diabetes medications decrease it. ... It seems the detrimental effects of caffeine are as bad as the beneficial effects of oral diabetes drugs are good..
The Effect of Caffeine on Heart Rate. Caffeine stimulates the central nervous system, which increases heart rate. Photo Credit Stockbyte/Stockbyte/Getty Images. Caffeine is a widely used psychoactive drug found in many drinks, such as coffee, tea and cola.Caffeine is naturally present in the leaves and seeds of a variety of plants.nce consumed, caffeine enters your blood from the stomach and small intestine and begins to stimulate your central nervous system. Caffeine stimulates receptors located in cells within your heart to increase your heart rate.