Chobani peach Yogurt has 20 grams of carbohydrate per 6 oz serving. Just because most of the Greek yogurts are non-fat doesn't mean that they are great for you. Most of the flavored versions have sugar or honey which of course will raise your BG a lot especially if you're not bolusing for it. For me, even if I bolus for things like this with sugar, my BG usually spikes before the insulin kicks in.
Actually many of us with Type 1 choose the full-fat versions of things like yogurt because the fat slows down the impact of carbs. Most Greek yogurts that you see in the store are non-fat and filled with sugar. I occasionally buy a full-fat type of Greek yogurt, and add berries and Splenda for sweetness. I would never eat any of the already flavored Greek yogurts.
I really don't like my full-fat Greek yogurts all that much. I feel like I'm eating sour cream! Dr. Bernstein in his book really recommends full-fat Fage Yogurt. I've never been able to find that, but I have found another brand that seems to work. Often the calorie/carb counts on the big containers of these yogurts are for 4 ounces which is 1/2 a cup. So you really have to be careful and read labels.
I tend to eat a regular full-fat plain yogurt that I like better than the Greek Yogurts. It has more carbs than the full-fat Greek yogurts, so I'm trying to convince myself to love the Greek yogurts instead.
This discussion prompts me to preach or complain on one of my frustrations. Places life Whole Foods and Trader Joe's are supposed to be so healthy and organic. The problem is that they put tons of honey and other sweeteners in a lot of their food. Maybe it's organic honey, but it's a catastrophe for those of use with diabetes. Same with places like Panera Bread. Oh yes, it's healthy, but even things like their chicken salad and balsamic vinaigrette are filled with carbs. I participate in a type 1 get-together that always meets at Panera Bread. It's a killer for my blood sugar.