Why do people think that lemon juice is good for your digestive tract and stomach when it is so acidic?

WHY ALSO HAVE HEARD IT MAKES YOUR BODY "ALKALINE"? HOW THAT WOULD BE TRUE WHEN IT IS ACIDIC?

also, I have read that it can help your metabolism to lose fat, is that true?
Update: https://youtu.be/WndFDIa6a0s
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