Many patients have a disorder known as Lactose Intolerance. This could happen at any age. Most of the time when patients get older, the lactose intolerance becomes more apparent. Those patients can definitely have diarrhea if they have any lactose containing meals such as any type of dairy meals. Now, the benefit of lactose intolerance is that it’s easily treated if you take a pill called lactaid, which has the enzyme that assists with that deficiency. Patients are able to eat dairy products, ice cream, milk without any issues, usually.