Not before every meal. but one cup in morning & one in evening. Lone term green tea drinks may seen some weight loss as we v some studies, even all over world world research.
Caffeine in tea acts on gastric cells and secrete more acid. All tea has got this. Discontinue for relief.
Don't drink tea after 2 PM as it affects quality of sleep and increase diseases. Drink as early as of the day starts.
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