For survival definitely. I always wanted a little hatch in my belly that I could just stick lumps of coal and scrap wood into, like a pot-bellied heater. Noticing that I'm hungry, deciding what I want to eat, shopping, preparing food and, finally, eating it, all present their own problems. When hyper-focused on something, I barely notice the need. The other tasks mean a battle against my executive function deficits, social phobia, and, very often, the apathy of depression. Eating only snack foods, or nothing at all, for days has never been unusual for me, and I've always been underweight.
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When you are fighting an invisible monster, first throw a bucket of paint over it.