noun
light eater; person who eats little
Describes someone who habitually eats small portions or has a small appetite. Neutral term.
彼女は小食家で、いつもご飯を少ししか食べない。
She is a light eater and always eats only a little rice.
小食家の私には、この定食は量が多すぎる。
For a light eater like me, this set meal is too much.
Compound of 小食 (small eating) or 少食 (little eating) + 家 (person). The exact derivation is uncertain, but the meaning is transparent.