After four weeks, the weights of the mice that were given green or black tea extracts dropped to the same levels as those of the mice that received the low - fat diet throughout the study. (sciencedaily.com)
However, only the mice that consumed black tea extract had an increase in a type of bacteria called Pseudobutyrivibrio, which could help explain the difference between how black tea and green tea change energy metabolism. (sciencedaily.com)