Recently, researchers from the University of Medical Sciences in Tehran, Iran, have found through comprehensive analysis that the intake of capsaicin and green tea can help control body weight. 

It is reported that the researchers evaluated a number of English articles on weight control published before March 2017. The functional components involved include green tea, caffeine, and capsaicin.

In total, the researchers evaluated 29 placebo-controlled trials and found evidence that large amounts of green tea reduced body weight, 

body mass index, and waist circumference in obese adult subjects, while capsaicin also “takes great advantage” in weight loss. This test report was published in the "Journal of Functional Foods" in July 2018.

It is understood that there are four sources of test data: PubMed/Medline, Scopus, Cochrane Library, and Web of Science. 

The researchers only selected a placebo controlled clinical trial for adults and used whole green tea as a test material instead of catechins and polyphenols in green tea. 

The results of the researchers’ interest in the trial also included several aspects, including not only weight changes but also changes in body composition, changes in body fat, and changes in body mass index.

Of the 29 trials evaluated by the researchers, 20 were green and green tea extracts in liquid and capsule form, 4 were caffeine supplements, 

and 5 were capsaicin and red pepper supplements. During the trial intervention, some subjects took physical exercise and some took control diets.

The researchers found that the test evaluation results showed that after the subjects took in green tea, green tea extract and capsaicin, 

there was a significant decrease in body weight. The mechanism of green tea may include catechins which can reduce the activity of pancreatic enzymes, 

thereby reducing the absorption of fat in the intestine and accelerating the excretion of fat; 

the mechanism of action of capsaicin includes increasing the energy consumption of fat people and the oxidation of fat, And regulate intestinal flora.

At the same time, the researchers found that caffeine had no apparent effect on various body measurements, 

and there were not enough randomized controlled trials to assess the effect of caffeine on body weight. 

Although some studies have shown that caffeine can affect physical performance and strengthen muscle strength, 

it still cannot explain its impact on human body weight. Therefore, researchers believe that the efficacy of caffeine weight loss needs more research.