By sick, I mean upset stomach and spends up to a couple hours on the toilet.

I don't know what I'm doing wrong. I use the most basic recipe for Biscuits and gravy (like, is there even any other way to make it?). I hardly even add much salt and pepper, if any at all, since I like to top mine with a lot when I serve it.

It's only my Biscuits and gravy too. His mom's never makes him sick. I make it the same way she does, even use the same sausage. I've tried getting out all excess grease to see if that helps, but it doesn't. He's had his mom's as an adult too, so it's not like this is just something that started as he got older. He's had it at restaurants too and it doesn't make him sick.

He's tried eating it several times over the last 6ish years and every time his body reacts the same way. I've never had an issue with it though.

Like, I know how to cook. This isn't because I'm incompetent in the kitchen lol. None of my other meals make him sick like this.

I've attached the recipe I use. I use Tennessee pride mild breakfast sausage.