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Fancy Lad Snack Cakes are a consumable item in Fallout 3.
Snack cakes give 5 Hit Points (6 with the food santizer) to the consumer, whilst inflicting 2 points of Radiation damage.
Some Fancy Lads Snack Cakes can be found in the Megaton house and the Tenpenny Tower suite after purchasing the pre-War theme.