Yogurt is healthy food unless it's
commercially sweetened. The flavored
yogurts sold in grocery stores are
sweetened for kids. A typical 6-ounce
serving contains as much as 25 grams (6
teaspoons) of added sugar. Glycemic loads
range around 110. If you add your own fresh
fruit to plain yogurt, you'll find that it
tastes great with no added sugar or maybe a
single teaspoon, which would have
negligible effect on the glyemic load.
Don't bother with low-fat yogurt. Just get
the no-sugar-added kind.