is onion good source of fiber?
Onion Nutrition Facts. In the rush to gather health information on the processed foods we eat, it can be easy to forget to check the nutritional facts of vegetables like the onion. Onions are high in vitamin C, a good source of fiber, and with only 45 calories per serving, add abundant flavor to a wide variety of food. Onions are sodium, fat, and cholesterol free, and provide a number of other key nutrients.