Esophilic Esophagitis (3.5e Flaw)
From D&D Wiki
The inability to hold down your food, and a resulting frail character.
Effect: Every time a character with this flaw eats or drinks anything, including potions, they must roll 1d20. If they roll a 7 or under, they lose any beneficial values of what they were ingesting, and vomit.
Along with this, a character with this flaw is very frail because of their inability to hold down all their food. They take -2 to all their fortitude saves.Subtract 15 pounds from the starting weight of a character with this flaw.