In familymart, there are Suntory's "Black Oolong" and Itohen's "Thick Oolong". Selling points are high concentrations of tea polyphenols.

Scientifically speaking, oolong tea has no effect on losing weight.

Tea polyphenols in oolong tea can regulate the metabolism of fatty acids and reduce the accumulation of fat; Inhibit the activity of fatty acid synthase in liver, reduce fat synthesis and inhibit visceral fat deposition. At the same time, it can inhibit the absorption of fat and promote the excretion of lipid compounds from feces. So oolong tea can prevent obesity, but it may not be able to lose weight. ?