Kefir adjustment period
When I first started consuming kefir, I did something stupid and drank a whole mug of homemade kefir on day one. For the first two weeks, I was farting a lot more and it would smell terrible when I would go to the toilet for a dump. After the first 2 weeks, the farting and bowel movement improved considerably. This made me realize the importance of starting slow...
The only explanation I could find online was that lots of bacteria was being killed in my gut.
I am glad though that I started this kefir journey as my health has improved noticeably.