A friend of one of my children claimed to be lactose intolerant but drinks goats milk. This is as a result of testing by a "highly trained nurse specialist in allergy". They are reluctant to describe the tests in detail but it sound like vega testing. This woman also told the child they were allergic to potatoes (but when they found exclusion too hard and reintroduced without problem they were told their gut had recovered after 2 weeks) and lemon.
This sounds to me like quackery and I am concerned that a real cause of illhealth is being missed. But the child has improved a bit (placebo effect/ cows milk protein intolerance?).
What do you do faced with what sounds like a quack?