The diets react (see scores below)
Diet Ratings
Contains 1-2g net carbs per tablespoon with added sugars in most commercial versions. Usable in small amounts but requires verification of sugar content and portion control.
Strict keto practitioners avoid all soy sauce due to added sugars and fermented soy concerns, while mainstream keto allows small amounts of low-sugar versions.
Dark soy sauce is typically made from fermented soybeans, salt, and water. Most versions are plant-based. However, some brands may contain animal-derived additives, caramel coloring from bone char, or be processed with non-vegan ingredients, requiring label verification.
Some soy sauce brands may use bone char in processing or contain fish sauce/anchovy paste as flavoring agents. Additionally, some caramel coloring may be derived from animal sources. Label verification is recommended.
Dark soy sauce is made from fermented soybeans (legumes) and contains high sodium. Soy is explicitly excluded from paleo due to anti-nutrients and processing.
Fermented condiment high in sodium and often contains added sugars. While fermented foods have some Mediterranean presence, soy sauce is not traditional and sodium content conflicts with Mediterranean guidelines emphasizing minimal salt. Use only as occasional seasoning in small amounts.
Some modern Mediterranean interpretations include fermented condiments for umami flavor; however, traditional Mediterranean cuisines rely on herbs, olive oil, and vinegar rather than soy-based products for seasoning.
Dark soy sauce is fermented from soybeans (legume/plant), contains plant-derived ingredients, added sugars, and additives. Violates carnivore diet principles on multiple counts.
Dark soy sauce is made from soybeans, which are legumes and explicitly excluded on Whole30. Soy in any form is not permitted. Coconut aminos is the approved substitute.
Dark soy sauce is typically made from soybeans and salt, fermented. Monash rates regular soy sauce as low-FODMAP in small amounts (1 tablespoon). However, dark soy sauce may contain added ingredients (garlic, onion, molasses) depending on brand. Fermentation reduces but does not eliminate GOS from soy. Check label and use sparingly.
Monash has tested soy sauce specifically and rates it low-FODMAP at 1 tablespoon serving, but dark soy sauce formulations vary by brand. Some commercial varieties add garlic or onion (high-FODMAP). Elimination phase requires verification of specific product and strict portion control (1 tablespoon or less).
Dark soy sauce is extremely high in sodium: ~900-1000mg per tablespoon. Single tablespoon exceeds 40% of standard DASH daily sodium limit (2,300mg). Incompatible with DASH sodium restrictions.
Dark soy sauce is high in sodium and contains minimal carbs and protein per typical serving (1 tbsp ≈ 1-2g carbs). While it adds flavor without significant macronutrient impact, the high sodium content and fermented nature require moderation. Usable as a flavoring but not a primary ingredient.
Dark soy sauce is a fermented condiment with some beneficial compounds from fermentation but is extremely high in sodium. While fermentation may provide some probiotic benefits, the sodium content is problematic for anti-inflammatory eating. Used in small amounts as a flavoring, it is acceptable, but regular consumption of high-sodium condiments can promote inflammation.
Some anti-inflammatory frameworks emphasize fermented foods for gut health and include soy sauce in moderation, while others flag the sodium content as a primary concern that outweighs fermentation benefits.
Dark soy sauce is calorie-free and adds flavor, but is very high in sodium (900-1000mg per tablespoon). Excessive sodium can worsen bloating and fluid retention—already a concern on GLP-1. Use in small amounts (1-2 teaspoons) as a condiment, not a primary seasoning.
Nutritional profile
Six traits that cut across every diet.
Fiber & Plants
How much whole-plant food and fiber it delivers.
Healthy Fats
The quality of its fats (unsaturated, omega-3).
Whole / Unprocessed
How close it is to its natural, unprocessed form.
Gut Gentle
How easy it is on digestion (low FODMAP, few irritants).
Low Glycemic
How little it spikes your blood sugar.
Protein Density
How much protein it packs per calorie.
Controversy Index
Score range: 1–8/10. Higher controversy = more disagreement between diets.
Diet-Specific Tips for Dark soy sauce
Keto — 5/10- 1-2g net carbs per tablespoon
- Often contains added sugars
- Requires portion control
- Verify sugar-free versions
Vegan — 8/10- Plant-based base (soybeans)
- Fermented product
- Processing method matters
- Brand-dependent additives
- May contain hidden animal products
Mediterranean — 4/10- High sodium content
- Often contains added sugars
- Non-traditional
- Fermented (minor benefit)
Low-FODMAP — 5/10- Fermented soy product
- GOS content reduced by fermentation but not eliminated
- May contain added high-FODMAP ingredients
- Portion-dependent FODMAP status
Zone — 6/10- High sodium content
- Minimal carbs per serving
- Fermented product
- Use as flavoring, not primary ingredient
Anti-Inflammatory — 5/10- fermented food with potential probiotics
- extremely high sodium
- minimal calories per serving
- used as condiment in small amounts
GLP-1 Friendly — 6/10- very high sodium
- minimal calories
- flavor support
- bloating risk if overused