Yogurt is fine depending on you ultimate goals. Raw plain yogurt would be optimal without all the added sugars and fruit. You can add fresh fruit yourself to make it taste better. Yogurt is partly predigested by friendly bacteria, so they are well tolerated even by people who do not have sufficient lactase in their intestines to digest milk (lactose intolerant). It also help maintain healthy bacterial flora in the intestines.
check the stickies at the top of the forum. TP's Carb Cycling link is in there