TCBY's fat free, sugar free, soft serve yogurt option is a Godsend for me in my healthy lifestyle weight loss journey. About once every 6 or 7 weeks I get their regular sized fat free, sugar free vanilla or butter pecan (whichever is available), and it does not cause weight gain, nor prevent weight loss. Having this delightful treat every now and then helps me to stay on track. I am so thankful to have this option available to me.