Have you fasted for 12 hours a day?

I'm trying to lose weight.
I walk home daily and walk to and from the train station from my job.
I always. get my 10K steps by the time I get home.
I was thinking of fasting for 12 hours. daily. Some of my friends do this & have lost weight.
Is it ok to have coffee in the morning & not eat anything till dinner?
Thank you
Have you fasted for 12 hours a day?
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