KETO VERDICTMODERATE
Yellow onions are moderately keto-friendly at ~7.6g net carbs per 100g. Use as an aromatic in small amounts to build flavor without overshooting carbs—think teaspoons/tablespoons, not cups.
Is Onion (Yellow) Keto?
Alliums
YOUR PORTION
How much are you having?
Scale the published reference values to your portion.
Per 100 g (as listed by source). USDA FoodData Central.
How this is calculated
total carbohydrate - fiber. Each published value is multiplied by your portion divided by the reference amount. No extra fiber, sugar alcohol or allulose deductions are applied here.
Grams and milliliters are not interchangeable. Household measures require a food-specific conversion; check your scale or product label.
7.6gnet carbs in your portion
- Total carbs
- 9.3g
- Fiber
- 1.7g
- Protein
- 1.1g
- Fat
- 0.1g
- Calories
- 40
Yellow onions are moderately keto-friendly at ~7.6g net carbs per 100g. Use as an aromatic in small amounts to build flavor without overshooting carbs—think teaspoons/tablespoons, not cups.
- Net carbs (100 g)7.6g
- Protein (100 g)1.1g
- Fat (100 g)0.1g
- Keto verdictEnjoy in moderation
NUTRITION FACTS
Per 100 g (as listed by source)
Net Carbs
7.6g
Total Carbs
9.3g
Fiber
1.7g
Protein
1.1g
Fat
0.1g
Calories
40
Source: USDA FoodData Central reference record
Source fit: generic reference; variety, brand, or preparation may differ
Net-carb calculation: total carbohydrate - fiber
This USDA record is used as a generic nutrition reference; variety, brand, or preparation may differ.
Nutrition record reviewed 2026-07-09. Maintained by KetoLens Team.
HOW TO ENJOY IT ON KETO
- Used in small amounts: ~20–30g adds only ~1.5–2g net carbs
- Essential aromatic: Builds depth in soups, sauces, sautés, and roasts
- Caramelization concentrates sweetness—use measured portions
- Prebiotic fibers can support gut health
- Versatile: raw, sautéed, roasted, grilled
- Contains quercetin and other beneficial polyphenols
PREPARATION SUGGESTIONS
CARAMELIZED
Slice thin and cook slowly in Butter or Olive Oil 30–40 minutes until deep golden; a spoonful adds sweet, complex flavor.
SAUTÉED BASE
Dice and gently sauté in fat as the base for soups, stews, and sauces—classic keto aromatics with Garlic and Celery.
ROASTED
Wedge, toss with Olive Oil and herbs, roast at 425°F (220°C) 30–35 minutes until tender and browned.
RAW IN SALADS
Thinly slice and soak in cold water 10 minutes to mellow bite; add for crunch and sharpness.
GRILLED
Thick rounds, brushed with oil, grilled until charred and tender—great on burgers or as a side.
ONION RINGS
Coat rings in seasoned Almond Flour and fry/air-fry for a keto-friendly appetizer (watch portions).