I don’t think he’s covering it out of shame or anything like that, it seems more that he’s grabbing it to remind himself of his message, like “be strong.” Plus, we don’t see a panel of him having eaten a donut so it could be interpreted either way, the comic artist tends to lean towards positive messages with a cynical twist so I think that’s intentional.
It’s also better than some of the actual “content” people put out there.