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In a 100g amount, maple syrup provides 260 calories and is composed of 32 percent water by weight, 67 percent carbohydrates (90 percent of which are sugars), and no appreciable protein or fat (table). Maple syrup is generally low in overall micronutrient content, although manganese and riboflavin are at high levels along with moderate amounts of zinc and calcium (right table). It also contains trace amounts of amino acids which increase in content as sap flow occurs.