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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Some macronutrients 4 letters:

CARB: Macronutrient, to a marathoner
FATS: Major macronutrients
FATS: Some macronutrients
CARBS: Marathoners' macronutrients
GRAMS: Macronutrient measurements