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Low GI

Onion Soup Calories

Caramelized onions, beef or vegetable broth, often served with bread and cheese.

CALORIES

38kcal

GI

35low

POTASSIUM

110mg

FIBER

1g

Onion Soup Nutrition Facts

Selected: 100 g

38

KCAL / 100G

Carbs

6.8g

· 69%

Protein

1.2g

· 12%

Fat

0.8g

· 19%

Fiber

1g

Onion Soup Vitamins & Minerals

Vitamins

B6

0.08mg · 5% DV

Vitamin C

3.5mg · 4% DV

B1

0.03mg · 3% DV

B2

0.02mg · 2% DV

Minerals

Sodium

320mg · 14% DV

Phosphorus

18mg · 3% DV

Potassium

110mg · 3% DV

Calcium

24mg · 2% DV

Onion Soup Glycemic Index

GLYCEMIC INDEX

35
Low
0 Low5570100

GLYCEMIC LOAD

2.4
Low

Accounts for portion size — a more realistic measure than GI alone.

Is Onion Soup Processed?

NOVA 2

Minimally Processed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Onion Soup Contain Allergens?

No known major allergens

Gluten free
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Onion Soup Good For?

Vegan

— Not suitable

Vegetarian

✓ Suitable

Gluten-Free

— Not suitable

Dairy-Free

— Not suitable

Mediterranean

✓ Suitable

Paleo

— Not suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

— Not suitable

Low FODMAP

— Not suitable

Onion Soup Fat Profile

SATURATED

0.2g

MONOUNSATURATED

0.2g

POLYUNSATURATED

0.2g

⚖️

Omega 6:3 ratio 3:1

Below the ideal 4:1 — a good omega balance.

Foods Similar to Onion Soup

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Tomato

18 kcal

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Mixed Green Salad

18 kcal

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Red Pepper

31 kcal

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Boiled Beetroot

44 kcal

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Green pepper

20 kcal

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Potato Salad

110 kcal

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Arugula

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Oven-Roasted Mixed Vegetables

65 kcal

Onion Soup — Frequently Asked Questions

Why does onion soup sometimes taste bitter or overly sharp?

The onions can remain sharp if they are not cooked slowly enough. Cook them over medium-low heat until soft and sweet; onions that scorch, however, can make the soup bitter.

How long does homemade onion soup keep in the fridge?

Cool it promptly and store it in an airtight container; it is generally best eaten within 3 to 4 days. Keep the toasted bread and cheese separate so they do not become soggy.

Can onion soup be frozen?

Yes, freeze the soup before adding bread or cheese, ideally in individual portions. Thaw it in the refrigerator and reheat thoroughly, then add fresh toppings before serving.

What bread and cheese work best with onion soup?

Toasted sourdough or whole-grain bread adds a satisfying texture. Melting cheeses such as Gruyère are traditional, while using less cheese makes the finished bowl lighter.

Is onion soup filling enough for a main meal?

It can make a light meal, but many versions are not especially high in protein on their own. Pair it with yogurt, eggs, cheese, beans, a bean salad, or another lean protein for a more satisfying meal.

Is onion soup better before or after a workout?

A small serving may suit some people a few hours before exercise, but onions can cause digestive discomfort for sensitive stomachs. After training, pairing it with a protein-rich food creates a more balanced recovery meal.

Can onion soup worsen heartburn or reflux?

Yes. Onions can trigger heartburn, reflux, or bloating in some people, particularly in rich, cheesy recipes or large servings. People with reflux may tolerate smaller portions better and may wish to avoid it late at night.

Can you eat onion soup on a low-FODMAP diet?

Traditional onion soup is usually not low FODMAP because onions are high in fructans. A lower-FODMAP alternative can use onion-infused oil for flavor and omit the onion pieces, following guidance from a dietitian if needed.

How is homemade onion soup different from instant onion soup?

Instant mixes are often higher in salt and may contain flavorings or thickeners. Homemade soup gives you much more control over the salt, fat, stock, and cheese used.

Do people with diabetes need to be careful with onion soup?

The effect on blood sugar depends greatly on added bread, flour, serving size, and the rest of the meal. Limiting the bread topping and pairing the soup with protein can help create a steadier, more balanced meal.

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Nutrition data compiled from USDA FoodData Central and scientific sources.