Fibro people tend to be low in protein. I had an OAT (Organic Acids Test) done and found I was extremely low in almost all of the amino acids. Amino acids are what proteins are made up of. You get proteins from the foods you eat and your body also makes proteins. If you are low, your body can't make some of the essential amino acids it needs because you are not ingesting enough protein, which your body uses to make other proteins. My ND put me on a protein powder which has helped me tremendously. I am gluten sensitive so the protein powder is rice based. If eating the protein bars helps you, you might ask to have the OAT test. Maybe you are protein deficient. I have noticed I don't get so hungry when I'm drinking my protein smoothies.