Posted 8/14/2015 6:55 PM (GMT -6)
It's nice of you that you care for your friend from a 3rd world country. What country does he exactly come from? Does he come from India?
It's highly unlikely that he'll be diagnosed with Crohn's disease. Based on my experience and research, I can say that one may end up with Crohn's disease, if he/she had been a picky eater in the childhood days and has overdosed on junk foods, processed foods with additives, sugary beverages, high fructose syrup and lately GMOs that absolutely disrupt the gut microbiome.
The IBD prevalence in the 3rd world countries is low, as they eat less processed foods. It's however rising drastically with people shifting their eating habits to western style. Depending on the formation of bio-films in the intestine and the population, different communities of harmful bacteria, he may end up with gastritis/GERD/IBD, but not IBD.
I come from India. I had the same problem like your friend's when I was a student. I had been admitted to hospital many times in India for food poisoning, as I vomited through out night uncontrollably. But, now I realise, it wasn't food poisoning. In fact, there is no such thing as food poisoning unless one eats rotten foods. It was a result of the thick yellow chemical fluid produced by harmful bacteria that live in the bio-film after I had eaten high FODMAP food (lemon).
Here is an interesting article on the devastating consequences of picky eating in children: