Gluten is the Latin name for "glue," and signifies the doughy complex of proteins within the wheat plant, further classified as either gliadins (alcohol soluble), glutelins (dilute acid or alkalis soluble), or other. Because wheat is a hexaploid species, the byproduct of three ancestor plants becoming one, with no less than 6 sets of chromosomes and 6.5 times more genes than found in the human genome, it is capable of producing no less than 23,788 different proteins. Those proteins slowly wreak havoc on your insides.
The immune reactions they incite slowly erode the intestinal wall, creating increasingly severe problems over a long period of time. Because of that immune response, gluten acts as an "intestinal abrasive". It sandpapers the intestinal wall it is so thin that it no longer functions properly.
The symptoms take so long to develop, in fact, that you get used to them. "That's just the way things are", you think, or: "That's just what happens when you get older." But you can become so used to them that they feel "normal". So large numbers of people take aspirin for their constant headaches, for example, never realizing that their diet is causing the problem. But it may very well be that you don't have to live with the symptoms you've become accustomed to, and that you don't have to take drugs to deal with them.
Try avoiding wheat and similar grains, including beer, for 30 days. You will feel more alive. Inflammation will subside. Recovery time will shorten. You will lose water weight and look more "cut".
Furthermore, eat some carbs with real nutritional value. See the vegetable family and enjoy food that is alive, rather than processed and stored for years.