>>21491677>That's when he became lactose intolerant out of the blue.That does happen sometimes. But if he also went a period of time without milk then tried to have it again, sometimes it can just take time for your body to readjust. I also seem to have issues digesting milk if something else has upset my stomach.
Some people have had success with just having small amounts of milk and increasing it over time. Like having just 1/4 cup per day for a few days, then 1/2 cup, and so on. You could suggest that if he hasn't tried it. That worked for me when I had to give up dairy for a while with an elimination diet.