Question 1

What is the ketogenic diet?

Accepted Answer

The ketogenic (keto) diet is a very low-carbohydrate, high-fat diet that shifts your body's primary fuel source from glucose to ketones. When carbohydrate intake drops below roughly 20–50g of net carbs per day, liver glycogen depletes and the liver converts fatty acids into ketone bodies (beta-hydroxybutyrate, acetoacetate, and acetone). This metabolic state — called nutritional ketosis — allows your body to burn fat efficiently for energy.

Question 2

How many net carbs can I eat on keto?

Accepted Answer

Most people need to stay under 20–25g of net carbs per day to reliably achieve nutritional ketosis. Some people with higher insulin sensitivity or significant activity can remain in ketosis at 30–50g, but 20g is the reliable threshold for everyone. Net carbs = total carbs − fiber − sugar alcohols (most types).

Question 3

How long does it take to get into ketosis?

Accepted Answer

Most people enter nutritional ketosis within 2–4 days of consistent carb restriction under 20g net carbs/day. The timeline depends on your glycogen stores (heavier people tend to have more), activity level (exercise depletes glycogen faster), and how strictly you maintain the carb limit. Blood ketones ≥0.5 mmol/L confirms ketosis. Urine strips and breath analyzers are less accurate.

Question 4

What is the difference between net carbs and total carbs?

Accepted Answer

Net carbs are the carbohydrates your body actually metabolizes for blood sugar. The formula is: Net Carbs = Total Carbs − Fiber − Sugar Alcohols (most types). Fiber passes through the gut largely undigested and doesn't raise blood glucose. Sugar alcohols like erythritol have minimal metabolic impact and are subtracted fully; maltitol has more impact and should only be partially subtracted. Our Net Carb Calculator handles all sugar alcohol types correctly.

Question 5

Is keto the same as Atkins?

Accepted Answer

They share low-carb principles but differ in focus. Atkins is primarily a carb-restriction protocol across phases, starting very low and eventually allowing more carbs. Keto specifically targets a metabolic state (ketosis) and maintains consistently high fat intake to fuel the body. Keto generally keeps fat intake much higher (65–80% of calories) to ensure adequate fuel on a permanent basis, while Atkins may allow more protein and eventually more carbs. Both can produce ketosis in the early phases.

Question 6

Do I need to count calories on keto?

Accepted Answer

Not necessarily in the early stages — ketosis naturally suppresses appetite through ghrelin reduction and ketone-mediated satiety signals. Many people lose weight without calorie tracking on keto. However, if weight loss stalls, calories matter. Fat is very calorie-dense (9 kcal/g vs 4 kcal/g for carbs and protein), and it's easy to overeat even on keto. Our Keto Macro Calculator provides personalized calorie targets to use as a soft guide.

Question 7

What are the standard keto macro ratios?

Accepted Answer

The classic ratio is 70% fat / 25% protein / 5% carbs from total calories. However, these are percentages of calories, not grams, and the right split depends on your body, goal, and keto variant. A better approach: set net carbs at 20g, set protein at 0.7–1.0g per pound of lean body mass, then fill remaining calories with fat. This approach preserves muscle and produces ketosis reliably without the guesswork of fixed percentages.

Question 8

How much protein can I eat on keto without leaving ketosis?

Accepted Answer

The concern about excess protein converting to glucose (gluconeogenesis) is often exaggerated. Gluconeogenesis is demand-driven, not supply-driven — eating more protein doesn't automatically produce more glucose. Most people can consume 0.7–1.0g of protein per pound of lean body mass without leaving ketosis. If you're very active or lifting weights, staying toward the higher end is important for muscle preservation. Deficient protein on keto is a bigger problem than excess protein.

Question 9

Why does the keto macro calculator give me different numbers than other calculators?

Accepted Answer

Most online keto calculators use simplified formulas or fixed ratios. MeKeto uses the Mifflin-St Jeor equation for BMR when body fat is unknown, and the more accurate Katch-McArdle equation when body fat percentage is provided. We also apply validated activity multipliers, goal-based calorie adjustments, and safe minimums. The result is a starting point meaningfully more accurate than a calculator using generic 70/25/5 ratios for everyone.

Question 10

What happens if I eat too much fat on keto?

Accepted Answer

Dietary fat on keto is your primary energy source, not an automatic health benefit. Eating more fat than your body needs for energy still creates a caloric surplus — and fat is stored whether it comes from your diet or your body stores. If weight loss is your goal and you're eating above your calorie target, stalling or gaining is possible on keto too. High fat is good; unlimited fat is not a requirement.

Question 11

How do I calculate macros for intermittent fasting + keto?

Accepted Answer

The calculation is the same — your daily calorie and macro targets don't change based on when you eat them. What changes is how you distribute them across your eating window. Our IF + Keto Calculator generates your macro targets and shows how to distribute them across your specific eating window (16:8, 18:6, 20:4, OMAD, or 5:2). The main adjustment: your last meal before the fast should be higher in fat to extend satiety through the fasting window.

Question 12

What is keto flu and how do I prevent it?

Accepted Answer

Keto flu is a cluster of symptoms — headache, fatigue, brain fog, muscle cramps, nausea, irritability — that typically appear in the first 2–5 days of keto. The cause is electrolyte loss: as insulin drops, kidneys excrete sodium, which triggers secondary losses of potassium and magnesium. Prevention: add 2,000–3,000mg sodium daily (salt your food, drink broth), 1,000mg potassium (avocado, spinach), and 300–500mg magnesium (supplement — glycinate or malate form). This eliminates or significantly reduces keto flu in most people.

Question 13

How much electrolytes do I need on keto?

Accepted Answer

General daily targets for active keto: 2,000–3,000mg sodium, 1,000–3,500mg potassium, 300–500mg magnesium. Sodium and potassium needs are higher if you exercise, sweat heavily, or live in a warm climate. Do NOT take potassium supplements over 99mg without medical guidance — high-dose potassium supplementation has cardiac risks. Get potassium from food (avocado, spinach, salmon, pumpkin seeds) and use electrolyte mixes like LMNT that are designed for keto. Our Electrolyte Calculator personalizes these targets.

Question 14

Is the keto flu dangerous?

Accepted Answer

No — keto flu is uncomfortable but not dangerous for most people. It's a sign that your body is adapting, not that something is wrong. The symptoms resolve within a few days as your kidneys recalibrate to lower insulin. Replenishing electrolytes (especially sodium) dramatically reduces symptoms. If you're on blood pressure medications or diuretics, talk to your doctor before starting keto — electrolyte shifts can interact with these medications.

Question 15

Will keto damage my kidneys or liver?

Accepted Answer

For people with healthy kidneys and liver, there's no evidence that nutritional ketosis causes organ damage. The concern about kidneys relates to very high protein intake (not high fat intake) — a distinction keto often gets confused with. For people with pre-existing kidney or liver disease, keto can affect organ function and medical supervision is important. This is not a reason for healthy people to avoid keto, but it's a reason to disclose your diet to your doctor.

Question 16

My cholesterol went up on keto — should I stop?

Accepted Answer

Cholesterol response to keto is highly individual. Many people see LDL rise alongside significant HDL increases and triglyceride reductions — a pattern that many cardiologists view as favorable. A subset of people (hypersensitive responders) see LDL rise significantly without the HDL/triglyceride benefits; these individuals may need to adjust fat intake or type. The full lipid panel matters more than isolated LDL. Work with your doctor to monitor and interpret your numbers in context, rather than reacting to LDL alone.

Question 17

Does keto work differently for women than men?

Accepted Answer

Yes — women tend to need a slightly higher protein ratio (22% vs 25% of calories), a lower calorie adjustment for weight loss (smaller deficit), and more attention to hormonal context. Thyroid function can be affected by very aggressive calorie restriction on keto. The menstrual cycle creates fluctuating insulin sensitivity — the luteal phase (days 14–28) often involves more carb cravings and insulin resistance. Our Women's Keto Calculator applies female-specific adjustments that generic calculators ignore.

Question 18

Can keto affect my menstrual cycle?

Accepted Answer

Yes — both positively and negatively. Reducing insulin resistance (which keto does well) often improves cycle regularity and reduces PCOS symptoms. However, very aggressive calorie restriction on keto — especially below 1,200 kcal/day — can disrupt the hypothalamic-pituitary-ovarian axis and cause irregular or missed periods. Adequate calorie intake and fat intake is critical for hormonal health on keto. If you're experiencing cycle disruptions, increase calories (especially fat) and consider tracking cycle phase.

Question 19

Is keto safe during perimenopause and menopause?

Accepted Answer

Yes, and it often helps. Keto's ability to reduce insulin resistance addresses one of the main drivers of perimenopausal weight gain. Estrogen decline reduces fat oxidation and metabolic rate — a 5% calorie reduction (which our calculator applies for post-menopausal women) accounts for this. Protein becomes more important than ever after menopause to prevent sarcopenia. Medical supervision is recommended if you take HRT or medications for blood pressure, as keto can affect how these work.

Question 20

Can keto help with PCOS?

Accepted Answer

There is growing evidence that keto significantly helps PCOS. PCOS is strongly linked to hyperinsulinemia — chronically elevated insulin. Keto directly addresses this by dramatically reducing insulin secretion. Studies have shown keto improves insulin sensitivity, reduces testosterone levels, improves menstrual regularity, and supports weight loss in women with PCOS. Our PCOS Keto Calculator uses a more conservative carb target (15g) for women with confirmed insulin resistance. Note: always work with your doctor, especially if you take Metformin or other PCOS medications.

Question 21

What are the different types of keto?

Accepted Answer

Standard Keto (SKD): 70/25/5 fat/protein/carb split — the baseline. Lazy Keto: only track net carbs (≤20g/day), ignore other macros. Dirty Keto: track macros but eat any food — no food quality rules. Targeted Keto (TKD): add 20–50g of fast carbs around workouts only. Cyclical Keto (CKD): keto days + planned carb-up days (typically 5–6 keto days, 1–2 carb days). Carnivore: zero plant foods, only animal products. See our Keto Types Guide for a full comparison table.

Question 22

Is lazy keto effective?

Accepted Answer

Lazy keto — tracking only net carbs and ignoring fat and protein — works well for many beginners. Most people naturally limit fat and protein intake when not tracking them, so simply staying under 20g net carbs often produces ketosis and weight loss without full macro tracking. The risk: some people overeat protein on lazy keto (which can slow fat loss) or overeat calories overall. For beginners wanting simple keto, lazy keto is a great start; for stalls or optimization, full macro tracking adds precision.

Question 23

Is carnivore keto?

Accepted Answer

Carnivore is a zero-carb subset of keto. By eating only animal products, carnivore dieters naturally stay in ketosis (no plant foods = no carbs). The macro distribution shifts — carnivore is typically 70% fat / 30% protein / 0% carbs, which is slightly higher in protein than standard keto. The main differences from standard keto are the elimination of plant foods (no fiber, no plant anti-nutrients), higher reliance on organ meats for micronutrients, and a focus on animal-source nutrition only.

Question 24

Who should do cyclical keto (CKD)?

Accepted Answer

Cyclical keto is designed for people who need carbohydrates for athletic performance but want the fat-adaptation and metabolic benefits of keto most of the time. It works best for: competitive athletes with high glycogen demands (CrossFit, HIIT, team sports), people who have been on keto for 8+ weeks and are fully fat-adapted, and people who want to combine keto with specific athletic goals. CKD is NOT recommended for beginners — you need to be fully fat-adapted before carb-ups are effective. Our Cyclical Keto Calculator calculates both keto day and carb-up day macros.

Question 25

How fast will I lose weight on keto?

Accepted Answer

The first 1–2 weeks typically produce rapid weight loss (3–10 lbs) — this is water weight from glycogen depletion, not fat. Actual fat loss on keto is similar to other diets when calories are equated: roughly 0.5–2 lbs per week depending on your calorie deficit and starting weight. A common rule of thumb: expect about 1 lb/week in sustainable fat loss at a moderate deficit. Our Weight Loss Calculator gives a week-by-week timeline based on your specific numbers and goal.

Question 26

Why did I stop losing weight on keto?

Accepted Answer

Plateaus are common at weeks 6–8. The most common causes: eating more than you realize (calorie creep, especially from fat), too much protein causing partial gluconeogenesis, hidden carbs in sauces or packaged foods, stress-elevated cortisol, under-sleeping, or simply metabolic adaptation (your body becomes more efficient). Diagnostic steps: track everything meticulously for one week, verify net carbs are genuinely under 20g, check electrolytes, and consider adding a brief calorie deficit or a temporary fat fast.

Question 27

Does keto cause muscle loss?

Accepted Answer

Keto can cause muscle loss if protein intake is inadequate. The solution is straightforward: consume at least 0.7g of protein per pound of lean body mass, lift weights regularly (even bodyweight training preserves muscle), and don't create an excessively large calorie deficit. With adequate protein and training stimulus, keto preserves muscle as well as any other diet. Some research even suggests keto is better at preserving muscle during weight loss compared to high-carb calorie restriction.

Question 28

Should I exercise on keto?

Accepted Answer

Yes — exercise enhances keto in multiple ways. Resistance training preserves muscle during weight loss. Aerobic exercise increases fat oxidation and can help deplete glycogen faster during keto adaptation. Exercise also improves insulin sensitivity, reducing how much insulin you secrete even in response to small carb intakes. The first 2–4 weeks on keto may feel harder for high-intensity exercise (the body isn't yet fat-adapted), but performance typically returns and often improves after 4–6 weeks.

Keto FAQ

Keto Basics

Macros & Numbers

Keto Flu & Side Effects

Women & Keto

Keto Variants

Weight Loss

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