It depends if you suspect that anyone in your cluster might make a stupid joke that you have to laugh at while you eat it
I had a stinking hangover the other day, but I had to give a lunchtime presentation to load of people in suits, and I couldn't force my breakfast down, and was consequently worried about my blood sugar crashing in the meeting, and someone asking me to confirm my actions for the next week, and me having to tell them the truth about why I wasn't with it.
However, there is a cluster guy who always makes flip jokes when I buy something from the vending machine, usually breakfast. Sooo... 15 minutes before the meeting, I went to the kitchen, made half a cup of tea with 4 tea bags in it, necked it, then got 2 dairy milks from the vending machine, and went to the disabled toilet to gobble them. Then back up and got my stuff for the meeting without a single stupid comment that might have completely destroyed my morale before the meeting