A research group led by Professor Kaoruhei Tokuyama of the University of Tsukuba found that drinking oolong tea or caffeine drink twice in the morning and noon for two weeks promotes daily fat burning without disturbing sleep, especially oolong tea. It was revealed that it has a remarkable effect during sleep.
There are many studies on the effects of tea leaf components on energy metabolism, but they are mainly about the effects (acute effects) when ingested once or a day.Considering the drinking habits of tea, it is important to evaluate the effect of repeated ingestion.It is also necessary to consider the effects on sleep due to the relationship between sleep and energy metabolism.
The study examined the effects of habitual intake of oolong tea on 24-hour energy metabolism and sleep compared to beverages containing only placebo (placebo) and caffeine.After having the subjects (12 healthy men) drink oolong tea or caffeine at breakfast and lunch for 2 weeks, energy metabolism and sleep were measured.
As a result, there was no difference in daily energy expenditure in any of the intakes, but the amount of fatty acid conversion in one day increased.In addition, the effects of oolong tea intake and caffeine intake on increasing fat burning were observed during sleep, but sleep was not inhibited in either case.In particular, the effect of promoting fat burning was greater when oolong tea was ingested than when caffeine was ingested, and a remarkable effect was observed especially during sleep.During the daytime, the rise in blood sugar and insulin associated with food intake strongly suppressed fat burning, and it is thought that the fat burning stimulating effect of oolong tea appeared during sleep.
In the future, it will be necessary to analyze the metabolic regulatory effects of components other than caffeine (polymerized polyphenols, catechins, gallic acid) contained in oolong tea, and to investigate the relationship between long-term habitual intake and obesity prevention effect. It is supposed to be.
