- A study of 12 normal-weight men, conducted by Department of Agriculture researchers. It showed that when the men drank five cups of water with caffeine in eight hours, they had a 3.4% increase in calories burned in a 24-hour period compared with drinking plain water. When they drank five cups of oolong (dark) tea containing the same amount of caffeine, they had a 2.9% increase in calories burned. The difference between the tea and the caffeinated water was not statistically significant.
After drinking the tea, they also experienced an increase in the amount of body fat that was used as fuel, suggesting that the caffeine and other components of tea may mobilize fat stores for use as energy, experts say.
- A study of 10 healthy young men conducted by Swiss researchers showed a roughly 3% to 4% increase in calories burned for men taking green tea extract and caffeine over those taking caffeine alone or a placebo. They also found an increase in the use of fat as fuel for those consuming the green tea extract.
- "In our study, men burned, on average, an additional 65 calories during the day that they drank the five cups of oolong tea. Scientists aren't sure whether it's the caffeine or the components called catechins in tea that may cause the metabolic increase," she says.
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