> "A big meal" might be 300 calories for somebody with an eating disorder

I knew a guy that complained that he "ate like a lion" and yet couldn't gain weight.

Turns out, his breakfast was typically a single egg and a slice of toast. Lunch would be half a sandwich and a bag of chips that he wouldn't finish. Dinner of course varied, but basically was like 4-6 oz of meat of some sort and a small side of veggies.

Overall, his daily calorie intake was probably only around 1,000 calories.

I don't know if this qualified as an eating disorder, or what, considering when we hear about someone undereating, it's because they're trying to lose weight. He was trying to GAIN weight and yet was still horrendously undereating.