[tharkun__]

I'm not your parent but similar issue. I doubt it's the CO2 if he's anything like me. I can drink coke all day long (well sugar free one anyway - but I don't drink pop except in rare cases)

Beer? Not much and it's worse the more days in a row I drink it. So 3 beers over 3 days total is worse than 3 beers one evening and then nothing.

And the alcohol doesn't matter. Same issue with alcohol free versions of the same beer. Hefeweizen like Erdinger which has lots of yeast on the bottom of the bottle is worse.

It's like the yeasty parts of the beer just take over my gut and wreak havoc.

I got things under control by both not drinking beer and switching to hard stuff if I'm after the alcohol part or just completely different drinks if I'm after the taste part as well as finding a probiotic that works for me.

Nota bene: for me I also got headaches with it all. Like really bad migraines and even with certain foods. The probiotics made it all go away as long as I don't overpower them with beer or Pizza for that matter. Ordered in Pizza, if I eat too much guarantees headache a day to two later.

[galangalalgol]

Some yeast produce more msg than others? The way it accumulates for over time seems quite different than the gp that indicated fast onset. That sounds more like they have an active allergy. Perhaps to sulphites?