The calorie distribution in the green salads is as follows.
Nutritional value of 2 cups of the leaves is as follows. Iceberg lettuce has 20 calories of which 44% is vitamin K. Spinach gives 14 calories with lots of vitamin A. Arugula and red leaf lettuce provide 8 calories with vitamin A and Vitamin K. Romaine lettuce has 16 calories and rich in vitamin K and Vitamin A.
Other than these the salads also provide folate, Vitamin C ans iron in substantial quantities.