@gailcalled thanks for the directions. I haven’t been buying sorbet since I have trouble with all the corn syrup in it. Never thought to make my own.
@Nullo I just had time to skim the answers but it seemed as if no one hit this point.
There are three factors to most dairy products that can potentially cause allerigies. Lactose the most common well known and manageable. Whey and casein.
I had a blood test to confirm these results as I am allergic to all 3. The IGG IGE and IGA testing is viewed as a diagnostic tool and some people consider it more accurate then others. I have found relief from my digestive problems when I follow it though so I advocate it.
The other way is to elliminate all of them for a week and then add casein back in small doses see if any symptoms return if not add whey back in wait a week and finally lactose.
The IGG reaction is a delayed response it may show up a day or two later in various symptoms. Which is why you spread the elliminating and adding in out. To clarify these results.
Also check all the labeling of any item you buy drink or otherwise pills etc. They sneak it in things you would never guess.
Another possibility is that your friend could be reactive. But only in larger quantities. It shows up as a cautionary watch intake don’t over do it or you will become increasingly sensitive to it. The general consensus is to have these items once or twice a week only.