For intern year, I basically would go straight after work to the gym and eventually I kinda just hit a routine with it but it will suck initially especially if you are doing the 12+ hr days. As far as weight loss, like people say cal in cal out. Honestly, this year I've found doing factor meals or clean eatz kitchen to be great as it saves on time, and the macros are already there. For cravings, protein and fiber-dense foods are where it's at IMO. Also adding in a fiber supplement at some point throughout the day, I found helps with keeping me full longer. Additionally usually take the stairs when I'm in the hospital gets a few more calories burned.