Calorie comparison
Onion vs Romaine Lettuce
Per 100 grams, romaine lettuce is the lighter choice by 23 calories, while romaine lettuce delivers more protein. The right pick depends on your goal — fewer calories for a cut, more protein to stay full.
Per 100 grams
| Per 100 g | Onion | Romaine Lettuce |
|---|---|---|
| Calories | 40 | 17 |
| Protein | 1.1 g | 1.2 g |
| Carbs | 9 g | 3.3 g |
| Fat | 0.1 g | 0.3 g |
Orange highlights the "better for a calorie deficit" value (fewer calories, fat and carbs; more protein). Your goals decide what "better" means.
Per typical serving
🧅 Onion
1 medium (110 g)
44 cal
1.2 g protein · 9.9 g carbs · 0.1 g fat
🥬 Romaine Lettuce
1 cup shredded (47 g)
8 cal
0.6 g protein · 1.6 g carbs · 0.1 g fat
Frequently asked
Which has more calories, onion or romaine lettuce?
Per 100 g, onion has 40 calories and romaine lettuce has 17. Romaine Lettuce is lower in calories.
Which has more protein, onion or romaine lettuce?
Onion has 1.1 g of protein per 100 g; romaine lettuce has 1.2 g. Romaine Lettuce wins on protein.
Is onion or romaine lettuce better for weight loss?
For a calorie deficit, the lower-calorie, higher-protein option usually helps you stay full on fewer calories. Here that leans toward romaine lettuce — but portion size matters more than which food you pick.
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