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Keto-Compatible Foods (ALLOWED)

Reference guide for ketoadaptation and nutritional ketosis. Carbohydrate load, portion size, and metabolic context determine metabolic impact.

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1. Oils & Fats (primary energy sources)

  • Avocado oil

  • Butter

  • Coconut oil

  • Ghee

  • Lard

  • Olive oil

  • Tallow

 

Note: essentially non-carbohydrate foods; no restriction from a carbohydrate perspective.

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2. Proteins

  • Beef

  • Chicken

  • Eggs

  • Lamb

  • Pork

  • Turkey

  • Game meats

  • Fish and seafood (all types, unprocessed)

 

Note: protein is not zero-impact; excessive intake may reduce ketosis efficiency via gluconeogenesis in some individuals.

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3. Vegetables (Non-Starchy)

  • Asparagus

  • Avocado

  • Broccoli

  • Cabbage

  • Cauliflower

  • Celery

  • Cucumber

  • Eggplant

  • Leafy greens (spinach, kale, lettuce, arugula)

  • Mushrooms

  • Olives

  • Peppers (capsicum)

  • Zucchini

 

Important:
Vegetables vary in net carbohydrate density.

  • Leafy greens = very low impact

  • Cruciferous vegetables = moderate but generally safe

  • Onion/pepper-type vegetables = accumulate carbs faster if overused

 

4. Fruits (Strictly portion-controlled)

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Fruits listed here are generally compatible within ketoadaptation when consumed in appropriate portions and within the context of total daily carbohydrate intake..

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Fat-based fruits

  • Avocado (fat-based fruit, very low net carb impact)

  • Coconut (fresh or unsweetened)

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Berry / carbohydrate-containing fruits

  • Blackberries (low–moderate impact depending on portion)

  • Blueberries (higher glycaemic load, strict portion control required)

  • Raspberries (preferred berry option)

  • Strawberries (moderate impact, portion dependent)

 

Citrus

  • Lemons

  • Limes

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Important:
Fruits are not “free foods” in ketoadaptation. Even low-glycaemic fruits can exceed daily carbohydrate targets when consumed in large or frequent portions.

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5. Nuts & Seeds

  • Almonds

  • Brazil nuts

  • Chia seeds

  • Flax seeds

  • Hazelnuts

  • Macadamia nuts (lowest carb, most stable)

  • Peanuts (legume; individual tolerance required)

  • Pecans

  • Pumpkin seeds

  • Sunflower seeds

  • Walnuts

 

Important:
Nuts are a common hidden carbohydrate source due to easy overconsumption.

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6. Dairy (Highly variable — critical category)

 

Dairy products vary in carbohydrate content depending on fermentation level, lactose reduction, and processing. Preference is given to fermented, aged, and low-lactose dairy products.

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Low-carb cheeses (core ketoadaptation-compatible)

  • Aged cheddar

  • Aged gouda

  • Brie

  • Camembert

  • Emmental

  • Feta (goat or sheep preferred; traditional preparation)

  • Gruyère

  • Jarlsberg

  • Manchego

  • Parmesan

  • Pecorino Romano

  • Provolone

  • Roquefort

  • Stilton

  • Swiss cheese (general category)

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Fermented dairy (generally compatible, individual tolerance dependent)

  • Kefir (unsweetened; fermented, lower lactose than milk/yogurt)

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Moderate lactose dairy (use awareness, portion-dependent)

  • Cottage cheese

  • Cream cheese (unsweetened)

  • Greek yogurt (unsweetened, full-fat; portion dependent)

  • Mascarpone

  • Quark

  • Ricotta

 

Dairy fats (metabolically stable baseline inputs)

  • Butter

  • Crème fraîche

  • Double cream (heavy cream)

  • Ghee

  • Sour cream (unsweetened, full-fat)

  • Whipping cream

  • Single cream

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Important:

Dairy compatibility is determined primarily by fermentation level and residual lactose content rather than product type alone. Even “keto-compatible” dairy can contribute to cumulative carbohydrate intake when consumed in large or frequent portions.

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7. Beverages

  • Black coffee

  • Herbal teas

  • Green / black / oolong tea

  • Mineral water / sparkling water

  • Unsweetened nut milks (almond, coconut, macadamia)

 

Important:
Always verify “unsweetened” status; most commercial nut milks contain added carbohydrates.

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8. Sugar Substitutes (use selectively)

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Sugar substitutes are not required for ketoadaptation. The preferred approach is complete abstinence during the adaptation phase to stabilise taste perception, insulin response patterns, and metabolic signalling. If used, they should be considered transitional tools rather than dietary staples.

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  • Allulose

  • Monk fruit

  • Stevia

 

Sugar alcohols (individual tolerance varies)

  • Erythritol (best tolerated)

  • Isomalt

  • Lactitol

  • Maltitol (highest glycaemic impact; avoid if possible)

  • Mannitol

  • Sorbitol

  • Xylitol

 

9. Starch Substitutes

  • Almond flour

  • Coconut flour

  • Flaxseed meal

  • Psyllium husk powder

 

10. Stabilizers & Emulsifiers

  • Agar agar

  • Gelatine

  • Guar gum

  • Lecithin (sunflower or soy)

  • Xanthan gum

 

11. Seasonings & Flavorings

  • Apple cider vinegar

  • Herbs (all fresh or dried)

  • Spices (cinnamon, turmeric, cumin, paprika, etc.)

  • Garlic

  • Mustard (no added sugar)

  • Natural extracts (vanilla, citrus, almond)

  • Sea salt / mineral salt

 

Important:
Pre-made sauces and spice mixes often contain hidden sugars and starches.

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12. Supplements / Functional Inputs

  • Collagen peptides

  • Electrolyte minerals (sodium, potassium, magnesium salts)

  • Inulin (fiber; may affect digestion individually)

  • MCT oil

  • Protein powders (unsweetened isolates only)

 

13. Chocolate / Cacao

  • Cacao nibs (unsweetened)

  • Dark chocolate (85–100% cacao, minimal ingredients)

  • Raw cacao powder

 

14. Fermented Foods

  • Sauerkraut (unsweetened)

  • Kimchi (unsweetened)

  • Pickles (fermented, not sweetened)

 

Core Principle

 

Keto compatibility is not defined by food inclusion alone, but by:

  • carbohydrate density per portion

  • cumulative daily intake

  • individual metabolic tolerance

  • frequency of consumption

 

Even “allowed” foods can interrupt ketoadaptation when consumed without portion awareness.

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