Answer: CARBO

AnswerCrossword Clue
CARBO...-load (prepare for a marathon)
carbocarbohydrate
carbofood having a high carbohydrate content
carboa carbohydrate
CARBO"Hydrate" lead-in
CARBO... loading (marathoner's prep)
CARBONutritional info
CARBO...-loading (marathon prep)
CARBO...-loading
CARBOBernie ..., former Red Sox slugger
CARBOBernie of the Red Sox
CARBOCharcoal
CARBOCoal: Latin.
CARBOBosox hero of 1975
CARBO...-loading (pre-marathon activity)
CARBORunners' term
CARBO..-loading (pre-marathon preparation)
CARBO.. loading (marathoner's ritual)
CARBOPasta or potatoes
CARBO..-loading
CARBO...-loading (marathoner's tactic)
CARBO...-loading (preparing for a marathon)
CARBOPre-marathon food, briefly
CARBOPasta, for example, briefly
CARBO..-load: prep for a marathon
CARBOLoading lead-in