check the ingredients
100% of yogurt in the supermarket has sugar or artificial sweeteners or people wouldn't buy them cause we can't have yogurt tasting like yogurt, it has to taste like a milkshake.
you have to go to a health food store and find unpasturized and unsweetened PLAIN yogurt
and no i don't consume yogurt regularly if that is what you are asking. some European cheese on occasion is all the dairy i mess with