A child and mother who suffer from malnourishment and must rely on food stamps, who had a single glass of milk for dinner, vs. picky eater kid who threw a tantrum and went to sleep hungry instead of eating cordon bleu.
I have a close family member who has an eating issue like what's described in the comment I was replying to. I also went to high school with several kids who admitted that they grew up waking up in the mornings not knowing if they would eat that day. The situations are not comparable.
Celiac's bodies attack themselves when they eat gluten. This ends up wrecking the small intestine and can lead to nutrients not being absorbed. It also gave me awful sinus headaches which is why (until I became more aware of it) I was incredibly averse to food.