One cup of raw spinach (about 30 g) provides roughly 7 calories and a solid dose of vitamin K, folate, and vitamin A, per USDA FoodData Central. It’s about as low-density as food gets — pile it into omelets, soups, and sandwiches to add volume and nutrients for almost no calories. Cooked spinach shrinks a lot, so a "cup cooked" is more nutrient-dense than a cup raw, but still very low calorie.
Key facts:
- 1 cup raw spinach: ~7 kcal
- Vitamin K, folate, A
- Adds volume, ~0 calories
- Use cooked or raw