Thin people aren't interested in eating when they're stressed, so they stop completely, or they feel queasy at the sight of food, too nervous to keep it down, so they don't dare eat.
These are both alien concepts to me, but thin people have told me these things as I looked at them in wonderment and tried to make my facial expression as caring & understanding as possible. Because anyone in distress deserves that much from me.
I'm in a flood plain that had a catastrophic flood in April 2007. My neighbors are evacuating. Some of them had water up to their ceilings on that date, with only 20 minutes' notice that the water was rising. I am leaving, too. I have entrusted some of my belongings with kindly people on the upper floors. I have made reservations at a motel on higher ground & was lucky to get a room. I feel sort of numb and sleepwalking through this whole thing. I feigned normality in the morning & went to the gym, then went grocery shopping, even cooked dinner, but as the day wore on, my tension headache grew & grew. I plan to get to bed early & be up early tomorrow. There's nothing I can do tonight.
Eating helps nothing. It's just a form of spinning one's wheels, as I wrote in another thread here. It won't get clothes packed, won't get belongings off the closet floors, won't get the gas tank filled or cash from the ATM. It won't get my cooler packed with healthy food for my hotel room.
Either sit with the anxiety, call a friend or loved one, or act methodically to prepare. Eating will just make you unhappier as well as frightened.