I have yet to find any Greek yogurt that wasn't either still full of sugar or was low/non-fat (which, ironically, is a great way to stay fat and get heart disease!).
I've listened to a lot of holistic doctors and this guy has been the best:
https://www.youtube.com/c/drekberg
He doesn't just say "Do this!" but, instead, goes through everything and explains in easy-to-understand terms why.
This is my favorite yogurt: