A light, starch-free vegetable soup — GI 13, low in calories and rich in water and fibre. Perfect as a meal-opening course that promotes fullness.
Mixed vegetable soup is a simple dish made from whatever is in the refrigerator, but its real secret lies in what it does not contain. The classic version loaded with potatoes, peas, and pasta turns it into a heavy starchy dish, while our recipe relies solely on low-carbohydrate vegetables, keeping it light on the stomach and on blood sugar alike.
The result is very low energy density — few calories per gram thanks to the high water content. This is exactly what makes a bowl of soup before a meal fill the stomach and reduce how much is eaten afterwards, a mindful eating behaviour that supports weight management [3].
Heat the olive oil in a pot over medium heat. Add the onion and garlic and stir until softened but not browned.
Add the carrot and celery and stir for 2 minutes until the flavours begin to open up.
Add the tomatoes and stir until they break down a little and release their liquid.
Pour in the vegetable broth, raise the heat to a boil, then reduce to a gentle simmer.
Add the zucchini and let the soup simmer gently until the vegetables are tender but not falling apart.
Season with salt, black pepper, and cumin. Taste and adjust.
Serve hot, garnished with fresh parsley or coriander. For a thicker consistency, mash a small ladleful of the cooked vegetables and stir back into the pot.
The glycemic index (GI) measures how quickly a food raises blood sugar, while the glycemic load (GL) measures how much a full serving raises it. Together they give the complete picture.
A low value (≤55) means a gradual rise in blood sugar — the most suitable range for diabetes and insulin resistance.
Glycemic load reflects the impact of the full serving. To lower it: take half a serving, or pair the recipe with a source of protein and fiber.
* Percent Daily Values are based on a 2,000-calorie diet per FDA food-label reference values — your daily needs may be higher or lower. Values are derived from the recipe's ingredients via the USDA database.
The most common problems when preparing Mixed Vegetable Soup, and how to fix them:
The simmer was too vigorous and the cooking time too long. Delicate vegetables like zucchini need a gentle simmer, not a rolling boil, and should be added after the firmer carrots. For next time: keep the heat at the lowest setting after the first boil, add the zucchini in the final third of cooking, and turn off the heat as soon as a fork pierces it easily.
Weak broth or too little seasoning. A light fat-free broth needs support: sauté the onion and garlic well at the start as they are the flavour base, add cumin and black pepper, and a squeeze of lemon juice at the end wakes up all the flavours without adding calories.
Ready-made vegetable broth is often high in sodium and salt was added on top. Next time: use low-sodium or homemade broth and season only at the end after tasting. To fix immediately: add a cup of water and a few extra carrot pieces that simmer briefly to absorb and balance the saltiness.
Too high a broth-to-vegetable ratio. For a thicker consistency without starches: remove a ladleful of the cooked vegetables, mash them and return them to the pot — this thickens the soup naturally. Or leave the pot uncovered for the last 5 minutes to let some liquid evaporate.
Green vegetables cooked too long. Zucchini and celery lose their vibrant colour with prolonged heat. Keep the cooking time within the stated range and garnish with fresh parsley or coriander at serving time to restore the lively green colour.
Both were added at the same time, but carrot needs longer. The rule: firm vegetables (carrot and celery) go in first, soft ones (zucchini) go in later. If this happens: remove the zucchini temporarily, let the carrot finish cooking, then return the zucchini for one final minute only.
Cooked soup: three days in an airtight container after cooling completely. It thickens slightly when cold — add a splash of water when reheating. Uncooked vegetables: cut and stored in a container, two days before cooking.
Freezes well for up to three months in airtight containers. The texture remains acceptable as it contains no starch. Zucchini softens slightly after thawing, which is normal.
Chopping vegetables: one day ahead, stored in a container in the refrigerator. Full cooking: the soup's flavour actually improves the next day, making it ideal for advance preparation.
Heat over low heat until it simmers lightly, or in the microwave for 2 minutes with a stir in between. Do not leave it out of the refrigerator for more than two hours after cooking.
| Original Ingredient | Tested Substitute | Ratio | Flavor Difference |
|---|---|---|---|
| Celery | Sliced leek stalk | same quantity | Free from the celery allergen — sweeter and milder flavour |
| Zucchini | Green squash or small eggplant cubes | same weight | Firmer texture, slightly deeper flavour |
| Vegetable broth | Water and a low-sodium stock cube | same quantity | More economical — watch the added salt in the cube |
| Fresh tomatoes | Canned diced tomatoes | 1 cup per 2 tomatoes | Deeper colour, more pronounced acidity, available year-round |
| Cumin | Dried thyme or a bay leaf | a pinch or 1 leaf | Mediterranean character instead of Middle Eastern |
| Number of servings | Mixed vegetables | Broth | Olive oil |
|---|---|---|---|
| 2 (individual × 2) | Half the quantity | 3 cups | 0.5 tbsp |
| 4 (base) | The full quantity | 6 cups | 1 tbsp |
| 8 (large family) | Double | 12 cups | 2 tbsp |
| 12 (entertaining) | 3× | 18 cups | 3 tbsp |
A bowl of soup before a meal is a smart strategy: start your meal with a bowl of this soup and its high water content fills the stomach with very few calories, so you eat less afterwards without feeling deprived. A simple habit that supports long-term weight management [4].
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