From the UK comes a good article about “nutritionists'” – an inexact title there and in the U.S. There are licensing laws in a majority of states to protect the medical consumer but many are not enforced or vaguely stated with lots of loopholes. You can trust a registered dietitian (many with advanced degrees) or someone with an advanced degree in nutrition science from an accredited university. Check out credentials carefully. Ask your physician for a referral.