Romaine lettuces has darker green leaves, and generally, the deeper the color, the better the nutrition. Romaine lettuce has more of a B vitamin called folate, more vitamin K, and more lutein (an antioxidant related to vitamin A).
Whenever you make a salad, choose the greens with the darkest coloring. Kale or spinach are even better than romaine or or iceberg lettuce, because the have even better nutritional value.
Nutritional Values for Iceberg and Romaine Lettuce
One cup of iceberg lettuce:
- 8.0 calories
- 0.5 gram protein
- 0.7 gram fiber
- 10 milligrams calcium
- 78 milligrams potassium
- 1.5 millgrams vitamin C
- 16 micrograms folate
- 13.3 micrograms of vitamin K
- 164 micrograms beta carotene
- 152 micrograms of lutein + zeaxanthin
- 8.0 calories
- 0.58 gram protein
- 1.0 gram fiber
- 16 milligrams calcium
- 116 milligrams potassium
- 11.3 milligrams vitamin C
- 64 micrograms folate
- 48.2 micrograms vitamin K
- 1637 micrograms beta carotene
- 1,087 micrograms of lutein + zeaxanthin.
Source: United States Department of Agriculture National Nutrient Database


