A very-low-carb, high-fat, moderate-protein way of eating built on grass-fed meats, pastured eggs, wild fish, leafy greens, and traditional fats. The clean version emphasizes real food and nutrient density, distinguishing it sharply from "dirty keto," which leans on processed meats, artificial sweeteners, and seed oils.
Sources: IFIC Food & Health Survey, 2020; Statista, 2020. Self-reported adherence varies widely across surveys; figures are approximate.
Keto is a very-low-carb eating pattern (typically under 20–50g net carbs per day) that shifts the body's primary fuel from glucose to fat-derived ketones. The "clean" version means whole, traditional, nutrient-dense foods only, no industrial seed oils, no fake sweeteners, no protein bars, and a strong emphasis on vegetables.
The ketogenic diet was originally developed at the Mayo Clinic in the 1920s as a medical therapy for refractory pediatric epilepsy and is still used in that role today. It re-entered the mainstream through Atkins in the 1970s, was scientifically refined by Stephen Phinney and Jeff Volek (The Art and Science of Low Carbohydrate Living, 2011), and was popularized as a whole-food approach by Dr. Eric Berg ("Healthy Keto") and Dr. Joseph Mercola, who both emphasize the importance of pasture-raised animal foods and abundant vegetables.
The core insight is metabolic: when carbohydrate is restricted enough that the liver runs low on glycogen, it begins producing ketone bodies (β-hydroxybutyrate, acetoacetate, acetone) from fatty acids. These ketones can fuel the brain, heart, and muscles, and they signal a number of beneficial pathways including AMPK and FoxO activation, mTOR suppression, and BDNF release.
Pastured eggs, grass-fed meats, wild fish, organ meats, leafy greens, cruciferous, avocado, olive oil, ghee, coconut oil, nuts. 7+ cups of vegetables per day. Strong nutrient density.
Processed bacon, hot dogs, "keto" snack bars, artificial sweeteners, seed oils. Hits the macros but is inflammatory and nutrient-poor. Tends to backfire over months.
If your great-grandmother wouldn't recognize it as food, it doesn't belong on the plate. No "keto" bars, no diet sodas, no seed-oil snacks. The label "keto" on a wrapper is the strongest possible signal that the product is processed.
Dr. Berg's signature emphasis: 7–10 cups of vegetables per day, primarily leafy greens and cruciferous. This is where the potassium, magnesium, vitamin C, vitamin K1, folate, and fiber come from. Skipping vegetables turns keto into a deficiency diet.
Grass-fed beef, pastured eggs, pastured pork, wild-caught small fish (sardines, anchovies, wild salmon). Don't fear protein, but don't overshoot it: ~0.7–1.0 g per pound of lean mass is the typical range.
As insulin drops, the kidneys excrete more sodium. Without aggressive electrolyte replacement you get the "keto flu": fatigue, cramps, headache, palpitations. Target: ~5g sodium, 4–5g potassium, 400–600mg magnesium daily, especially in the first weeks.
Grass-fed/finished beef, pastured eggs (2–6/day), pastured pork, lamb, bison, wild salmon, sardines, anchovies, mackerel, oysters. Organ meats 1–2x/week (liver is the most nutrient-dense food on earth).
Spinach, kale, romaine, arugula, broccoli, cauliflower, cabbage, Brussels sprouts, zucchini, asparagus, peppers, celery, cucumber, mushrooms. Some root vegetables in moderation (radishes, turnips).
Extra-virgin olive oil, avocado oil, coconut oil, MCT oil, grass-fed butter, ghee, tallow, duck fat, pastured lard. Avocados, olives, nuts (macadamia, pecan, walnut, brazil), and seeds (chia, flax, pumpkin).
Sauerkraut, kimchi, fermented pickles, plain coconut yogurt or grass-fed kefir, bone broth, raw apple cider vinegar.
Berries (raspberries, blackberries, strawberries, blueberries, moderate), lemons, limes. Saved for after fat-adaptation; usually 1/4–1/2 cup as needed.
Soybean, canola, corn, cottonseed, sunflower, safflower, "vegetable" oil, margarine. The single most important elimination. Found in virtually every restaurant meal and processed food.
Sugar, high-fructose corn syrup, agave, honey (mostly), maple syrup. Also: aspartame, sucralose, acesulfame-K, these disrupt the microbiome and keep sweet cravings alive. Allowed: small amounts of stevia, monk fruit, allulose.
Wheat, oats, rice, corn, quinoa, and all flours made from them. Also: bread, pasta, pastries, cereal, granola, "keto" bread products that use processed wheat-protein isolates.
Beans, lentils, chickpeas, peanuts, carb content is too high for ketosis. Soybean products especially should be limited (most are GMO + seed-oil processed).
Bars, cookies, ice cream, chips, cereals, breads marketed as keto. Most contain wheat protein isolates, gums, fake sweeteners, and oxidized seed oils. The label is a warning sign, not a green light.
Skip or strongly limit milk and cheese from grain-fed, hormone-treated cows. If using dairy: grass-fed butter, ghee, raw cheese, and fermented dairy (kefir, full-fat yogurt) from pastured animals.
A typical 16:8 day. Adapt timing, portions, and macros to your individual context.
No food. Drink water with a pinch of pink salt, lemon juice, and (optional) a quality electrolyte mix. One cup of black coffee, espresso, or tea is fine, no sweeteners, no creamers, no MCT-oil bullet (the bullet versions break the fast and tend to slow weight loss).
16 oz water with a pinch of pink Himalayan salt + 1/2 lemon's juice · 1 cup of black coffee (90 min after waking) · optional electrolyte sachet (sodium + potassium + magnesium). No food, no sweeteners, no creamers. This is the simplest possible practice and the foundation of the day.
3 pastured eggs scrambled in 1 tbsp ghee · 2 cups sautéed spinach in olive oil with garlic · 1/2 avocado · 4 oz wild salmon or 2 slices nitrate-free pastured bacon · large mug of plain bone broth. If hungrier, add another egg or extra greens. Macros land around 30g fat, 30g protein, 5–8g net carbs.
Eggs · greens · avocado · wild salmon or pastured bacon · bone broth. All real-food fats and proteins. Bone broth adds collagen, glycine, and electrolytes; the greens cover potassium, magnesium, folate, and vitamin K.
6–8 oz grass-fed ribeye or wild salmon · 3 cups mixed leafy greens with extra-virgin olive oil + lemon · 1 cup roasted Brussels sprouts or broccoli in ghee · small side of fermented sauerkraut · sparkling water with lime. Optionally: 1/4 cup berries with a tablespoon of full-fat coconut yogurt for dessert.
Grass-fed steak (or wild salmon) · big leafy salad with olive oil + lemon · roasted cruciferous in ghee · fermented sauerkraut. Eating early (5:30–6:30 PM) gives you a 13–14 hour overnight fast before the next morning's water-and-electrolyte ritual.
Stop eating at least 3 hours before sleep to allow blood sugar to settle and growth hormone to rise overnight. A glass of water with sea salt + magnesium glycinate can prevent overnight cramps and improve sleep quality.
The #1 cause of the "keto flu." Aim for 5g sodium, 4–5g potassium, 400–600mg magnesium per day, especially in weeks 1–4 and around exercise. Most cramps, headaches, and fatigue are electrolyte issues, not "low carb."
Going to bacon-and-cheese keto is the classic trap. Without abundant leafy greens and cruciferous vegetables, you become deficient in potassium, magnesium, folate, vitamin C, and fiber. Aim for 7+ cups daily.
Aspartame, sucralose, acesulfame-K. They disrupt the gut microbiome, sustain sweet cravings, and (in some studies) raise insulin acutely. Stick to small amounts of stevia, monk fruit, or allulose if needed.
Conventional bacon, hot dogs, deli meats with nitrites, preservatives, and seed oils. Switch to pastured, nitrate-free versions and treat as occasional add-ons rather than dietary staples.
Easy, dense, satisfying, and easy to overeat. Many people stall by eating large amounts of dairy. If progress stops, drop dairy for two weeks and observe.
Excess protein can be converted to glucose (gluconeogenesis), keeping you out of ketosis. Aim for moderate protein (~0.7–1.0 g per pound of lean mass) and let fat fill the remaining caloric need.
Not a substitute for food, but transitioning into ketosis, and staying there long-term, is meaningfully easier with a few foundations in place.
| Supplement | Why | Typical Dose | Notes |
|---|---|---|---|
| Electrolytes (Na + K + Mg) | Replaces what insulin-suppressed kidneys excrete; prevents "keto flu" symptoms | 5g sodium · 4–5g potassium · 400–600mg magnesium per day | Most cramps, headaches, fatigue are electrolyte deficits. Pink salt, cream of tartar, magnesium glycinate. |
| Vitamin D3 + K2 | D3 deficiency is near-universal; K2 directs calcium to bone, not arteries | D3: 5,000–10,000 IU · K2 MK-7: 200mcg | Test 25-OH-D quarterly. Target 50–80 ng/mL. |
| Omega-3 Fish Oil | Anti-inflammatory; balances omega-6 from any residual nuts/seeds | 2–3g EPA+DHA per day | Use a third-party-tested, low-oxidation product. Wild fish 3+ times/week reduces the need. |
| Methylated B-Complex | Removing grains can lower B1, B6, folate intake | 1 capsule daily with breakfast | Use methylated forms (methylfolate, methylcobalamin), especially if MTHFR variants present. |
| Digestive Enzymes (lipase-forward) | Helps digest the high-fat load, especially without a gallbladder | 1–2 capsules with each large meal | Berg specifically emphasizes ox bile + lipase for post-cholecystectomy patients. |
| MCT Oil (C8/C10) | Quick-converting medium-chain fats; supports ketogenesis | 1–2 tablespoons/day, build up slowly | Start with 1 tsp to avoid GI upset. Useful pre-workout or in fasted-state coffee. |
| Iodine + Selenium | Removing iodized salt and seaweed can lower iodine status | Iodine: 150–300mcg · Selenium: 200mcg (2 Brazil nuts) | Both are important for thyroid health on long-term low-carb. |
| Magnesium Glycinate | Insulin-low states cause the kidneys to excrete more magnesium; the glycine form is gentle on the gut and supports sleep, muscle relaxation, and overnight nervous-system calm | 300–500mg elemental, at bedtime (or split AM/PM) | Most cramps, palpitations, and "keto insomnia" respond rapidly to this single addition. Skip oxide and citrate if loose stools are an issue. |
| Zinc L-Carnosine | The carnosine-bound zinc complex adheres directly to the gut mucosa and supports barrier repair, particularly useful while transitioning into a higher-fat diet | 75–150mg/day (delivers ~16–33mg elemental zinc) | Take with food. After 8–12 weeks, drop to once daily to avoid copper depletion. Pair with 2mg copper if used long term. |
Often the cleanest indication: rapid HbA1c, triglyceride, and waist-circumference improvements.
Strong evidence for clinical remission (Virta Health 5-year data). Medications must be adjusted by a physician.
The original medical use, still standard of care under specialist supervision.
Early but encouraging data for Alzheimer's, Parkinson's, and traumatic brain injury recovery.
Strong evidence for steatosis reversal, particularly when paired with weight loss.
Only under close endocrinology supervision; ketoacidosis risk if insulin management is imperfect.
Not the right time to dramatically restrict carbohydrates; nutritional needs are different.
Restrictive frameworks can re-trigger disordered patterns. Work with a clinician.
Some patients see T3 drop on long-term very-low-carb. A modest amount of starchy vegetables (sweet potato, winter squash) often helps.
Possible but requires careful periodization. Many ultra-endurance athletes thrive; many high-intensity sprinters do not.
Add ox bile + lipase for at least the first 6–12 weeks to handle the fat load comfortably.
Clean keto works powerfully for some bodies and poorly for others. Take it as a framework, not a religion, and combine it with the lab work, symptom feedback, and clinical guidance specific to you.