These reports showed that chocolate consumption was associated with a substantial reduction in the risk of cardiometabolic disorders such as coronary heart disease and stroke. Recent meta-analyses suggested that ingestion of chocolate reduced the risk of cardiovascular diseases. Of these foods, chocolate is known to be rich in flavan-3-ols, including the flavan 3-ol monomers, (+)-catechin and (−)-epicatechin, and oligomers, B-type procyanidins that are linked by C4-C8 bonds. We conclude that improvement of metabolic syndrome risk factors following ingestion of chocolate may be induced, in part, by the mitochondrial biogenesis-promoting effect of flavan-3-ols.įlavan-3-ols, a group of polyphenolic substances, are distributed in a number of plant foods such as cocoa beans, red wine, and apples. These results suggest that flavan-3-ols enhances lipolysis and promotes mitochondrial biogenesis. The mitochondria copy number in gastrocnemius and soleus muscles and brown adipose tissue were increased significantly by administration of flavan-3-ol fraction. Uncoupling protein (UCP) 1 was increased significantly in brown adipose tissue by flavan-3-ols. The protein level of carnitine palmitoyltransferase 2 (CPT2) was increased significantly by flavan-3-ols in skeletal muscle, but not in liver. The mean blood pressure was significantly decreased in flavan-3-ols treatment group compared with control group. The mean respiratory exchange ratio (RER) over 24 hours was reduced significantly in the flavan-3-ols group. At the end of the experimental period, animals were sacrificed after blood pressure and the mean respiratory exchange ratio (RER) over 24 hours were measured. The mice were divided into two groups, and administered either distilled water or 50 mg/kg of flavan-3-ol fraction for 2 weeks. In order to elucidate the mechanism, we evaluated the influence of flavan-3-ols derived from cocoa powder on energy metabolism in mice using an indirect calorimetric method. Numerous clinical studies have reported that ingestion of chocolate has reduced risk of metabolic syndrome.
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