Feed yourself.
This one may seem obvious, but it bears repeating over and over again. Eat something. You can’t care for others if you don’t care for yourself, and part of caring for yourself means eating.
There were certainly moments in residency when I survived on saltines and call cocktails (diet ginger ale + cranberry juice), and times as an attending when I pushed through lunch because there were so many patients to see. What have I learned after all these years in medicine?
Feed yourself. And whenever possible, make it something incredibly delicious and memorable.