Soy sauce is a fermented condiment made from soybeans, wheat, salt, and water. In small amounts, it contains minimal net carbohydrates and is commonly used in low-carb cooking for umami flavor. Some varieties contain wheat and added sugars, so label reading is important.

Quick Carb Snapshot

  • Carbs (per 100 g): ~4–5 g
  • Carbs (standard portion): ~0–1 g per tbsp
  • Glycemic Index: Very low
  • Similar Low-Carb Options: Tamari, coconut aminos (higher carbs)
  • Blood Sugar Impact: Lower (portion-aware)
  • Keto-Friendly? Yes (small amounts)

Key Traits

  • Texture: Thin liquid
  • Flavor: Salty, umami
  • Carb Impact: Low
  • GI / GL Notes: Minimal glucose effect
  • Common Uses: Marinades, stir-fries, sauces

Best For

  • Flavoring low-carb dishes
  • Marinades and dressings
  • Asian-inspired cooking

Avoid For

  • Gluten-free diets (regular soy sauce)
  • High-sodium restrictions
  • Sugar-added varieties

Why Choose Soy Sauce for Low-Carb Eating

Texture & Structure

  • Liquid seasoning only
  • No thickening properties
  • Used in small quantities

Flavor & Nutrition

  • High sodium
  • Minimal calories
  • Strong umami impact

Storage & Shelf Life

Pantry

Shelf-stable unopened; refrigerate after opening for best quality.

Cooked

Dishes store normally depending on recipe.

Signs It Has Gone Bad

  • Off smell
  • Mold around cap
  • Flavor deterioration

Allergy & Dietary Flags

  • Gluten-Free: No (unless tamari)
  • Nuts: No
  • Nightshade: No
  • Vegan / Vegetarian: Yes

Often compared to tamari and coconut aminos, soy sauce delivers
strong umami with minimal carbs when used correctly.

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