All Foods
Asparagus vs Onion
Calories, macronutrients and nutrition facts compared side by side (per 100g).
Nutrition Comparison
| Per 100g | Asparagus | Onion |
|---|---|---|
| Calories | 20kcal | 40kcal |
| Protein | 2.2g | 1.1g |
| Carbs | 3.9g | 9.3g |
| Fat | 0.1g | 0.1g |
| Fiber | 2.1g | 1.7g |
| Sugar | 1.9g | 4.2g |
| Sodium | 2mg | 4mg |
Green marks the more favorable value (fewer calories/sugar/sodium, more protein/fiber).
Key Takeaways
- Asparagus has 20 fewer calories per 100g than Onion (100% less).
- Asparagus delivers more protein (2.2g vs 1.1g per 100g).
- Asparagus has more fiber (2.1g vs 1.7g).
- Asparagus has less sugar (1.9g vs 4.2g).
Asparagus
Asparagus is very low in calories yet rich in folate, vitamin K and the prebiotic fiber inulin. It is a natural source of the antioxidant glutathione and acts as a mild diuretic.
View Asparagus nutrition →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 →Track Asparagus & Onion in Kairo
Just photograph it. Kairo's AI reads the portion and the nutrition — three seconds later the calories and macros are in your log, no typing.
Get Kairo on the App Store