There is a similar expression GIGO (garbage in, garbage out) that I hear on workout videos but, quite importantly, it’s about the garbage you tell yourself and not the garbage you consume - don’t let it dominate your thinking about yourself because that’s where more damage is done. It was a party day, nothing more, nothing less!
I hope you managed to survive the supermarket @Pippa246 and are beginning to feel better.
I have survived a day in the sun surrounded by pimms, champagne and beer. Ordinarily I would have been on it but quite interesting noticing that no one else in the group was really going for it and I would have been doing it alone (and probably not noticing either). So glad I didn’t.