Buteyko breathing fans: How important is it to use the Frolov device or do bag breathing on an empty stomach?

[tastyfood]

I have some of Artour Rakhimov's books, and he highlights the importance of doing the breathing exercises on an empty stomach, How important do you think that is? According to the books, it is about not pushing it when having inflammation in the stomach due to offending foods?

Being able to use the Frolov device at any time of the day would be a great advantage, otherwise daily usage becomes a nuisance.

If you follow Buteyko and do bag breathing/Frolov, let me know what you think .

Thank you!