Hunger

is a Tier 1 Sense Path Spell.

The caster makes a subject feel hungry (even if they've just eaten). At Tier 2+, the subject can't help but eat if something edible is available; at Tier 3+, the subject becomes desperate for food and it impacts their actions. At Tier 4+, the hunger becomes debilitating. Doesn't actually increase the subject's need to eat.