"regimen" is just about the right word for thiese kind of restrictions.Life, the body, health is about the middle way...about finding the right swing and listening to all the wonderful things that life can give you. You will not need a heavy metal cleanse because you had 3 ribs on a barbeque night!! Your body was made with wonderful abilities of restaurations without you having to do anything. If your body had a craving for meat this one day - why be so forceful and restrictively anal to not give in to yourself. of course you shouldnt go crazy about these things but cutting contact to your brother?! I dont get that. Would you let your "regimen" get into the way of having a loving family relationship? Of course you know best yourself whether drinking and smoking is a problem for you and whether happens a lot more than you would admit here.
The way I see it, if you had fun that night and it isnt something that happens every week then it was probably good for your mind and wellbeing on a different level. If you beat yourself up you are abusing yourself.