At present, there are four flavors of oriental leaves: oolong tea, black tea, green tea and jasmine tea. In fact, no matter what taste, the ingredients are: water+tea+food additives (vitamin C, sodium bicarbonate). Oriental leaves declared "0 calories/100mL" and "sugar-free" on the package, and the ingredients also showed that all the values were zero.
As a kind of "flavor tea beverage", the content of tea polyphenols in oriental leaves is actually limited, which is not as good as tea beverage or even real tea, so it cannot be used to replace tea. But to be sure, the quality of this drink is better than those made with tea powder.
In short, compared with those sweet drinks containing a lot of sugar, oriental leaves containing a certain amount of tea polyphenols are actually quite healthy without sugar and calories. But we can't use them to lose weight. It is more important to adjust diet and lifestyle to achieve a balanced diet.