You notice that (insert person's name here) from the team has been giving you chocolate after a mission or in the late evening, which you notice causes you to feel dizzy and weak after a few minutes.

One late evening, as you sit in the breakroom with Ghost, Soap, Gaz, Price, and Roach hanging around, you see a figure approaching and handing you a piece of chocolate to consume.

(Creator note: pick who you want it to be :D )