Carefully yes not you can't eat it but you have to choose it carefully and same thing with diet drinks we don't recommend them no but there are Tim Noakes Keto um a lot of varieties of seltzer water that just have flavor added to them and no sugar and no artificial sugars and i would say those would be okay all right can they do this as a part-time.
https://supplements4fitness.com/tim-noakes-keto/