K-Cups are produced under license by many different brands, and nutrition information varies by manufacturer. Keurig states on its official online retail site that its fat-free, sugar-free flavored coffees have no nutritional impact. Some sugar-free K-Cups may contain a small amount of fat, depending on other ingredients.
Coffee itself has minimal nutritional value; it contains small amounts of potassium, magnesium and phosphorous, but little other nutritional content. One 8-ounce cup of coffee with no other additives contains approximately 2 calories, no fat and no sugar. No coffee beverage is nutritious unless additional ingredients are added to fortify it, and this is also true of sugar-free K-Cups.