A study at the University of Geneva in Switzerland was published in “The American Journal of Clinical Nutrition”. In the results researchers found that men burned more calories if they were given a combination of green tea extract and caffeine as opposed to those only given caffeine or a placebo.
Another study in the U.S. found that overweight men, drinking green tea, three times a day, burned over 200 extra calories a day. This occurred when there were no other changes to their diet or exercise routines. The green tea participants also found that their energy levels increased greatly.
Also, studies in The Netherlands & Japan have shown that green tea (or green tea extracts) helps fight obesity and lower LDL “bad” cholesterol.
In the Netherlands study, participants who drank green tea lost weight. However, those who drank caffeinated green tea lost more weight than those drinking decaffeinated green tea. Researchers speculated that this was because the caffeine helps with fat oxidation.
In the Japanese study, participants were given varying amounts of green tea extract over a three month period. The results showed that those who received the highest amount of green tea extract lost the most weight. Also they had lower blood pressure and lower LDL “bad” cholesterol.
Green tea helps burn fat by speeding up the metabolic rate. It can do this because its antioxidant effect helps the liver to function more efficiently. A green tea extract has been shown to stimulate fat oxidation and induce thermogenesis. The metabolic rate increased by 4% without increasing the heart rate.