Headaches caused by kefir?

[losenotloose]

I started making my own kefir a few months ago. Both me and dh we really enjoying it but he started getting headaches a couple of weeks after he started drinking it. Are headaches caused by kefir a thing? I've had a quick Google but it's confusing!

I’ve never made my own but I’ve been drinking it daily for 4/5 years with no issues. I’ve never heard of kefir headaches before.

I've made my own for years and no issues.

Has he made other healthy lifestyle changes? If he has cut down on oxalate heavy foods and beverages, he may be experiencing oxalate dumping which can make you feel terrible with a headache like a hangover.

He read up online and there is information out there saying some people can suffer with headaches but wasn't sure whether it was true. I looked on the Zoe website too.

No other dietary changes!