Is it necessary to drink kefir on an empty stomach?

How do you all take your kefir?

I've read that it's recommended to drink it first thing on an empty stomach by itself but there was no explanation why or how long to leave before you can eat something else.

Just wondering about the reasoning because I tend to eat fruit first thing and kefir later in the day. It would be nice if I could drink it with food though because then I'd have time to take more.