Fish sauce is a fermented condiment made from fish and salt, commonly used in Southeast Asian cooking. It contains virtually no carbohydrates and is highly concentrated in flavor, making it suitable for low-carb, keto, and diabetic-friendly diets when used in small amounts.

Quick Carb Snapshot

  • Carbs (per 100 g): ~1–2 g
  • Carbs (standard portion): ~0 g per tbsp
  • Glycemic Index: Zero
  • Similar Low-Carb Options: Tamari, soy sauce
  • Blood Sugar Impact: Lower
  • Keto-Friendly? Yes

Key Traits

  • Texture: Thin liquid
  • Flavor: Salty, pungent, umami-rich
  • Carb Impact: Negligible
  • GI / GL Notes: No blood glucose impact
  • Common Uses: Marinades, stir-fries, sauces

Best For

  • Boosting umami without carbs
  • Keto Asian-style dishes
  • Flavoring soups and sauces

Avoid For

  • Fish allergies
  • Very low-sodium diets
  • Sweetened varieties

Why Choose Fish Sauce for Low-Carb Eating

Texture & Structure

  • Pure liquid seasoning
  • No thickening effect
  • Used in drops to tablespoons

Flavor & Nutrition

  • Extremely concentrated flavor
  • Virtually calorie-free
  • No sugars or starches

Storage & Shelf Life

Pantry

Shelf-stable; refrigerate after opening for optimal flavor.

Cooked

Dishes store normally depending on recipe.

Signs It Has Gone Bad

  • Cloudiness
  • Off smell
  • Mold around cap

Allergy & Dietary Flags

  • Gluten-Free: Yes
  • Nuts: No
  • Nightshade: No
  • Vegan / Vegetarian: No

Often used alongside tamari and soy sauce, fish sauce provides
zero-carb umami depth.

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