Indeed. Now, while people with Crohn's vary in terms of appearance despite the fact that Crohn's usually makes it harder to absorb nutrients - for instance I am extremely underweight (worse than a runway model, for what it's worth) due to my Crohn's, but there are people with Crohn's who are seriously underweight - Alfred to my knowledge had symptoms extremely typical of Crohn's, and I haven't come across anything suggesting he wasn't suffering a lot form the illness. Throughout his life, he constantly suffered episodes of abdominal pain, diarrhea, and (if I remember correctly) something the medieval folks interpreted as hemorrhoids around the anal area. These episodes - which, typical to Crohn's, could and can occur anytime randomly - put a lot of stress on Alfred throughout his life. Imagine if you're a great warrior king, in the middle of a crucial campaign, and suddenly the day right before battle you suffer from extreme diarrhea and fatigue. It's quite amazing Alfred was able to do what he did with what appears to be a moderate to severe case of Crohn's.