The metabolism-boosting activity of coffee is derived from caffeine, a psychoactive central nervous system stimulant that works to improve your body’s metabolic rate.
Caffeine blocks the inhibitory neurotransmitter adenosine and increases the release of neurotransmitters like dopamine and norepinephrine. These neurotransmitters help improve metabolism and release fat from the body.
According to a 1980 study published in the American Journal of Clinical Nutrition, after eating a meal, coffee has immediate effects on your metabolism, especially on your fat oxidation.
Further, a 2004 study in the same journal determined that after a 4.5 mg per pound dose of caffeine, the metabolism rate went up by 13 percent.
A 2006 study in the same journal observed that coffee may increase thermogenesis, in part by increasing fat oxidation.
Another 2010 study published in Food Science and Biotechnology explains that caffeine works to break down fat by stimulating the nervous system. This signals fat cells to break down fat.
In a review published in 2011 in Obesity Reviews, researchers examined six such studies and found that caffeine supplementation increases body’s energy expenditure over a period of 24 hours.
As too much caffeine can be counterproductive, it is recommended to drink just 2 to 3 cups of coffee a day.
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