Food Allergy (3.5e Flaw)
From D&D Wiki
You have an extreme allergy to a type of food.
Effect: When exposed to a specific type of food (for example a certain nut or grain) you must make a fortitude save DC 20. If not, you take 1d4 con damage immediately and an additional 1d4 con damage in one minute.
Benefit: Bonus Feat.