A study followed 4,280 adults over 14 years. It found that those with a higher flavone intake from foods and beverages like black tea had a lower body mass index (BMI) than those with a lower flavone intake ( 12 ).
However, keep in mind that this was a test-tube study, so it’s unclear how the effects of white tea may apply to humans.
Some theorize that black tea’s potential weight loss effects may be because it’s high in flavones, a type of plant pigment with antioxidant properties.
Oolong tea is a traditional Chinese tea that has been partially oxidized, putting it somewhere between green tea and black tea in terms of oxidation and color.
White tea has a distinct flavor very different from other types of tea. It tastes subtle, delicate and slightly sweet.
In one study, 102 overweight or obese people drank oolong tea every day for six weeks, which may have helped reduce both their body weight and body fat. The researchers proposed the tea did this by improving the metabolism of fat in the body ( 13 ).
They differ from traditional teas because they do not typically contain caffeine, and are not made from the leaves of Camellia sinensis .
Another small study gave men either water or tea for a three-day period, measuring their metabolic rates. Compared to water, oolong tea increased energy expenditure by 2.9%, the equivalent of burning an additional 281 calories per day, on average ( 14 ).