The doctor who authorized my medical marijuana use told me to stop drinking OJ and to stop drinking seltzer water with grape juice. Is that necessary? I really miss those drinks.

Unless you're diabetic and you're overdoing it no you do not have to stop drinking OJ

Not at all that's not necessary. I don't quit anything I love. OJ is a good source of vitamin C so we don't know what he's talking about I have multiple sclerosis and I know how good antioxidants from grape juice and all the other vitamins from things we ingest are good for you