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Stay away from diet sodas what an oxymoron water as a beverage is a more sensible choice. Let food be your medicine, start with a sensible diet supervised and monitored by a holistic physcian who was schooled in general as well as alternative medicine . Find a frum Rav who does not adhere to the standard Ashkenazim Diet (SAD), but is open to healthier eating choices. You can work as a team (Rav., Physician and yourself) to help create a healthier lifestyle.