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Low Carb Fideo – Mexican Noodle Soup

Low Carb Fideo – Mexican Noodle Soup
Home » Diets » Low carb Mexican recipes » Mexican noodle soup

Traditional Sopa de fideo (aka Mexican noodle soup) is a soup made with noodles, onion, a tomato-based sauce and chicken broth. Finding a substitute for the noodles was the main key to modifying fideo to be low carb fideo. In the recipe below we used shirataki noodles for the fideo and no one blinked at a loss of flavor.

Bowl of low carb Mexican noodle soup - Fideo
Low carb Mexican noodle soup – Fideo

Jump to: RECIPE | What is Fideo? | Traditional vs Low Carb Versions | Substitution Ideas | Tips for Best Flavor

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** Note: This is a guest post from my daughter Tesla**

What is Fideo?

The word fideo refers to the noodles used in the soup. Typically they are a shorter, skinnier version of spaghetti.

Fideo is often referred to as “Mexican baby food” or as the original Mexican ramen.  However, my first experience with fideo was in Spain while I was volunteering at a school for 1-4 year olds.  Guess what they served the babies?! Fideo, por su puesto. (Fideo, of course).

Traditional Fideo vs. Low Carb Fideo

Even though my parents had not tasted the comfort food that is fideo, I wanted to be able to share in the comfort with them – but sans carbs (carb is a four-letter word at my parents house!).  So I set out to find a low carb fideo noodle. 

This is when I happened upon the shirataki noodle made from mushrooms (*note: the recipe used shirataki noodles made from tofu since that is what my mom found at her grocery store).

The shirataki noodle is very low in carbs and has no sugar.  

Ingredients for making low carb sopa de fideo
Ingredients for making low carb sopa de fideo

How to Use Shirataki in Fideo

With a traditional fideo recipe you crisp the noodles first by a light fry or sauté.  The directions on the shirataki noodle package instruct you to rinse and drain and then dry fry the noodles.

In the recipe below, I did not cook the shirataki noodles ahead of time. I simply rinsed them and allowed them to drain while cooking the soup ingredients. I then added them to the heated pot and cooked them slightly within the pot with the tomato base (before adding the water).

I was curious if shirataki noodles would stand up to that method of cooking and was pleasantly surprised that they did. 

Even though slightly less crunchy, the shirataki noodles didn’t soak up all the liquid like regular fideo noodles do, which I was also happy about.

Ideas for Additions or Substitutions to Low Carb Fideo

Sopa de fideo is really simple and extremely flexible. You can add meat or fish or make it vegetarian. A variety of different vegetables or beans can be added.

During tomato season, fresh heirloom tomatoes can be used instead of canned tomatoes (*note: make sure and add tomato paste if using canned tomatoes).

Many different seasoning blends can be used in the soup, from spicy to mild. Fideo is a definite plus to add to your weeknight recipe repertoire!

Cooking Tips for Best Flavor

  1. I typically like to prepare all my mis en place (each ingredient in separate little bowls) first.  I like onion, so I didn’t dice too finely- I just cut the onion in fourths and used my mandolin to slice the onion but you can dice as finely/ coarsely as you prefer. The noodles I used had instructions to rinse and fry before use, but I didn’t fry the noodles first before using them in this recipe- just rinsed and let them drain out while I was completing the next steps.  
  2. Traditional fideo is shorter noodles, so you could cut the shirataki before adding to the pot, or while cooking in the pot for a more authentic experience. 
  3. If you are adding pre-cooked meat or vegetables, add them before covering with water. Depending on the type of vegetables you add, this may require simmering for a longer time.
  4. Add salt and bouillon to taste. I like 1 tsp salt and 2 tsp bouillon.
  5. Serve with lime and a cold beverage!

If you enjoy all types of Mexican food, check out this category of ALL Mexican recipes, where you will find over 40 Mexican recipes, from casual, to low carb, to fancy.

Low Carb Sopa de Fideo

Bowl of low carb Mexican noodle soup - Fideo
A popular Spanish or Mexican tomato noodle soup modified to be low carb by using shirataki noodles.
5 from 5 votes
Prep Time 10 minutes
Cook Time 15 minutes
Servings 6
Calories 25


  • 8 ounces shirataki noodles
  • 2 tablespoon olive oil
  • 1 large onion chopped
  • 2-5 cloves garlic mashed and then minced
  • 2 10 ounce cans Rotel diced tomatoes with green chiles
  • 2 tablespoon tomato paste
  • 5-6 cups water
  • 2 teaspoon chicken bouillon base I use Better Than Bouillon
  • ¾ teaspoon salt or to taste
  • 2 medium limes optional


  • Empty shirataki package of noodles into a strainer, rinse and let sit while preparing the broth.  
    8 ounces shirataki noodles
  • In a large pot or dutch oven, heat 2 tablespoons oil over med-high heat.  Add chopped onion and saute for 5-8 minutes until caramelized.  Add garlic and stir in for 30 seconds.
    2 tablespoon olive oil, 1 large onion, 2-5 cloves garlic
  • Add the 2 cans of diced tomatoes and 2 tablespoons tomato paste.  Stir together.  Add drained shirataki noodles and stir into the tomato base for a minute or two.  Add water to cover (5-6 cups) and 2 teaspoons bouillon base and salt to taste.
    2 10 ounce cans Rotel diced tomatoes with green chiles, 2 tablespoon tomato paste, 5-6 cups water, 2 teaspoon chicken bouillon base, 3/4 teaspoon salt
  • Bring mixture to a boil and then reduce heat and simmer soup for 10-15 minutes or until heated through.  I took my plastic spatula and cut the noodles while they were simmering.  Alternatively you could leave them long or cut them ahead of time. 
  • Serve with lime squeezes and a cold beverage.  Buen Provecho!
    2 medium limes



With a traditional fideo recipe you crisp the noodles first by a light fry or sauté.  The directions on the shirataki noodle package instruct you to rinse and drain and then dry fry the noodles.
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Calories: 25kcalCarbohydrates: 5gProtein: 1gFat: 0.1gSaturated Fat: 0.04gPolyunsaturated Fat: 0.05gMonounsaturated Fat: 0.04gCholesterol: 0.1mgSodium: 503mgPotassium: 98mgFiber: 1gSugar: 2gVitamin A: 82IUVitamin C: 3mgCalcium: 17mgIron: 0.2mg
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¡Buen Provecho!

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Recipe Rating

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Susan Metoxen

Thursday 11th of April 2019

It's great to find noodles without adding carbs!

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