Greek yogurt has less natural sugar lactose and more protein than regular yogurt. This means that ounce for ounce, you are getting a nutritional punch of calcium (a single cup has almost 25% of your daily requirement) and that translates to more lost body fat and better health. Yogurt also contains beneficial bacteria that calm down inflamed digestive tracts as well as boosting your immune system. Your digestive tract is where 70% of your immune system resides.