This episode of our Does This Have Gum in It? Series explores the functions gums play in granola bars—specifically reduced sugar granola bars. While high intensity sweeteners replace the sweetness sugar contributes to granola bars, it is not easy to replace the texture, stability, gloss, stickiness, and film forming attributes sugar provides that shape and bind bars together. 
Add-Here 3200 from TIC Gums replaces the texture attributes and bonding qualities needed but with significantly less sugar. http://web2.ticgums.com/reduce-sugar-granola-bar