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Onion vs Spinach (Raw)

Calories, macronutrients and nutrition facts compared side by side (per 100g).

Nutrition Comparison

Per 100gOnionSpinach (Raw)
Calories40kcal23kcal
Protein1.1g2.9g
Carbs9.3g3.6g
Fat0.1g0.4g
Fiber1.7g2.2g
Sugar4.2g0.4g
Sodium4mg79mg

Green marks the more favorable value (fewer calories/sugar/sodium, more protein/fiber).

Key Takeaways

  • Spinach (Raw) has 17 fewer calories per 100g than Onion (74% less).
  • Spinach (Raw) delivers more protein (2.9g vs 1.1g per 100g).
  • Spinach (Raw) has more fiber (2.2g vs 1.7g).
  • Onion contains less fat (0.1g vs 0.4g).
  • Spinach (Raw) has less sugar (0.4g vs 4.2g).

Onion

Onions are low in calories and a notable source of quercetin, an antioxidant flavonoid, plus prebiotic fibers that feed gut bacteria. Their sulfur compounds — released when chopped — are being studied for cardiovascular benefits.

View Onion nutrition →

Spinach (Raw)

Spinach is a nutritional powerhouse, exceptionally rich in vitamin K, vitamin A (as beta-carotene), vitamin C, folate, and iron. It contains powerful antioxidants including lutein and zeaxanthin for eye health. At only 23 calories per 100g, spinach is one of the most nutrient-dense foods per calorie.

View Spinach (Raw) nutrition →

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