The benefits of spinach are many. Leafy greens like spinach provide more nutrients than any other food, when compared calorie for calorie. Here are some spinach facts to consider: The nutritional value of spinach indicates it to be a very nutrient-dense food. It is low in calories yet very high in vitamins, minerals and other phytonutrients. When you consume this healthy food, you don’t need to worry about your weight-loss diet as you take in abundant, good-for-you nutrients.