Keto Flux Reviews This slimming tea is not as popular as green tea, but it certainly deserves attention. It was named after the city of Puer in Yunnan Province of China, and it belongs to a variety of black tea. Studies have shown that Pu-Erh tea not only promotes weight loss , but also lowers blood sugar and triglyceride levels. Black tea, another popular type of tea with a mass of useful substances, will also help you lose weight. It contains a huge amount of antioxidants, called flavonoids or polyphenols. Studies show that drinking black tea eliminates the risk of developing type 2 diabetes.