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The mums from Mumsnet recently put a variety of milk allergy questions to our own expert Dr Adam Fox.

One mum brought up the idea that Guernsey milk contains a different form of casein that is easier for humans to digest.

She also mentioned that her brother “was a sickly, snotty, weedy kid in the 60s and 70s” but as an adult, had removed milk from his diet to dramatic effect.

“He is now a farmer and has access to unhomogenised milk from a single herd of pure-bred Guernsey cows, which he seems to be able to drink without any unpleasant symptoms.” she said.

Dr Fox replied that, in his experience, if your immune system has a problem with milk then it doesn’t matter where the milk comes from, it will still be a problem.

“Virtually all milk allergic kids will also react to goat or sheep milk. Very occasionally I have patients who can surprisingly tolerate specific milk-containing products, yet they will react to others. This is most likely related to them having a problem with a specific milk protein that is not found in that product due to the manufacturing process. This may explain your brother being better with one milk rather than another.”