Homemade meal replacement bar question

I would like to make home made protein bars as all of the ones in the store are junk. I need a binder to hold it together but all of the normal binding ingredients are either syrups, butters, peanut butter, or eggs. I am allergic to eggs and can't digest any type of butter and can't have and don't want all of the calories from oils. I also can't have peanut butter due to my horrible digestive disorder. I can't have fruits and veggies. Does anyone know of anything that I can use as a binder that isn't a fruit, vegetable, egg, milk, peanut butter, syrup, honey, molasses, or any type of calorie heavy product. I really don't want to add any calories to my bars and that includes sugars. I will be using vanilla rice protein powder, rolled oats, cinnamon, and a little ground flaxseed. I just need a binder to hold it together, but I can't have any type of binder that I have found suggested on the internet. Thanks!