But, not all greens are created equal and some contain significantly more nutrition than others. What you choose at the salad bar can make all the difference between fully satisfying your daily recommended dose of nutrients and simply contributing to it.
We ranked eight popular salad greens in order from least to most nutritious, according to the CDC’s powerhouse fruits and vegetables list.
The CDC determined the nutritional density of these greens by looking at how well they fulfilled the average person’s daily requirement for 17 important nutrients: potassium, fiber, protein, calcium, iron, thiamin, riboflavin, niacin, folate, zinc, and vitamins A, B6, B12, C, D, E, and K.
They assigned each food a specific nutrient density score, on a scale of zero to 100, that calculates to what extent 100 grams of each green includes the daily recommended amount of these 17 nutrients, assuming a 2,000 calorie diet.
Here’s what they found:
Nutrient Density Score: 18.28
Poor iceberg lettuce -- it doesn't have the best reputation. And while the salad green might be at the low-ranking end of this list, it still contains fiber, potassium, zinc, calcium, folate, Vitamin A, and Vitamin K. Plus, it has a high water content, which is always a good thing.
Nutrient Density Score: 49.07
One cup of kale satisfies all your daily requirements for vitamins A, C and K. Plus, it has three grams of protein to boot.
Nutrient Density Score: 63.48
Romaine is a solid source of Vitamin K and A, as well as folate.
4 Leaf Lettuce
Nutrient Density Score: 70.73
Leaf lettuce is high in potassium and vitamins A and K.
Nutrient Density Score: 73.36
Chicory greens are a good source of thiamin, niacin, and zinc.
Nutrient Density Score: 86.43
Spinach is a nutritional powerhouse. It's loaded with vitamin K and A, as well as manganese and folate.
Nutrient Density Score: 100
Watercress contains 106 percent of your daily recommended intake for vitamin K, 22 percent for vitamin A and 24 percent for vitamin C. It also contains calcium, iron and magnesium.
Knowledge is power. Now go make some salads!
- This article originally appeared on HuffPost.