The regular consumption of tea also suppressed damaging changes in the blood linked to fatty foods that can lead to type two diabetes.
Want to shed those additional pounds but still eat your favourite foods? Well, drinking tea could be the solution.
Both types of tea suppressed body weight gain & the build-up of stomach fat linked to a fatty diet.
In the study some mice got a high fat diet & others a traditional diet. Each of these groups were then split in to smaller groups & given water, black tea or green tea for 14 weeks.
But black tea, which is used in most ordinary cuppas, also counteracted the harmful effects on the blood normally associated with a high-fat diet.
These included increases in cholesterol, high blood glucose & insulin resistance - a precursor to type two diabetes where the body does not effectively use the insulin it produces.
The study was published in the Journal of Agricultural & Food Chemistry.