thinkThin® Protein & Fiber Bar Cupcake Batter. 150 calories. 10g protein. 5g fiber. 5g sugar per serving. Naturally flavored. Finding nutritious, delicious snacks on the go was always a challenge for me, so I created ThinkThin® protein & fiber bars. With ThinkThin® protein & fiber bars, my goal was to create a bar with a wonderful balance of protein and fiber to help keep you full and satisfied - all for 150 calories. To your vitality, (founder of ThinkThin®). †All ingredients have been produced without genetic engineering. GMO free†. GF, certified gluten-free by GFCO.