I don't know yet. I have hashimotos. I started on Keto and lost 30 pounds in 6 months, but then stalled for 6 months. Went for my regular check-up and doc says to switch to mediterraen or WW. This one seems the easiest, so I joined. I losr only 4 pounds in 3 weeks. but it's a loss. Anyome with this disporder knows how hard that is. plus I'm 63. Keep it up, it works, , , , , just slower.