Calorie comparison
Mushrooms vs Onion
Per 100 grams, mushrooms is the lighter choice by 18 calories, while mushrooms 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 | Mushrooms | Onion |
|---|---|---|
| Calories | 22 | 40 |
| Protein | 3.1 g | 1.1 g |
| Carbs | 3.3 g | 9 g |
| Fat | 0.3 g | 0.1 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
🍄 Mushrooms
1 cup (70 g)
15 cal
2.2 g protein · 2.3 g carbs · 0.2 g fat
🧅 Onion
1 medium (110 g)
44 cal
1.2 g protein · 9.9 g carbs · 0.1 g fat
Frequently asked
Which has more calories, mushrooms or onion?
Per 100 g, mushrooms has 22 calories and onion has 40. Mushrooms is lower in calories.
Which has more protein, mushrooms or onion?
Mushrooms has 3.1 g of protein per 100 g; onion has 1.1 g. Mushrooms wins on protein.
Is mushrooms or onion 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 mushrooms — but portion size matters more than which food you pick.
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