Keto FAQ: 30 answers you need to know
You're considering keto, or you've just started, and you have questions. Fair enough. Below are the 30 most-asked questions about the keto diet, answered briefly and without detours. No sales talk, just what you need to know.
The basics
Foundations first. What keto really is, what you eat, and how many carbs you can have.
1What is the keto diet exactly?
A way of eating where you consume fewer than 20 to 50 grams of carbs per day. Your body switches from burning sugar to burning fat, a state called ketosis. Lots of healthy fats, moderate protein, few carbs.
2How many carbs can you eat per day?
Most people reach ketosis at fewer than 20 to 30 grams of net carbs per day. Net means: total carbs minus fiber. Some can handle up to 50 grams, but start at 20 grams for the fastest result.
3Is keto the same as low carb?
No. Low carb usually means fewer than 100 to 150 grams of carbs per day. Keto goes further: under 20 to 50 grams, so your body actually produces ketones as fuel. The difference is in the metabolic state. More on this in keto vs low carb.
4How do you know if you're in ketosis?
The most reliable method is a blood ketone meter. Cheaper options: urine ketone strips or paying attention to signals like less hunger, more energy, a metallic taste in your mouth, and clearer thinking. Urine strips are inaccurate but give an indication early on. Read all about it in how to know you're in ketosis.
5How fast do you lose weight on keto?
The first week you lose 2 to 6 pounds, mostly water. After that, 1 to 2 pounds per week is realistic. Total result depends on your starting weight, how strict you eat, and how much you move. Keto works, but no diet drops 30 pounds in a month.
What you can and can't eat
The questions everyone asks: can I have this, not that? Short version below.
6Can you eat fruit on keto?
Limited. Most fruit contains too much sugar. Exception: berries. A handful of raspberries, strawberries, or blueberries fits in your daily budget. Avocado is technically a fruit and is unrestricted on keto.
7Which vegetables can you eat on keto?
All above-ground vegetables are fine: spinach, broccoli, cauliflower, zucchini, lettuce, cucumber, bell pepper, asparagus, green beans. Underground vegetables (potato, sweet potato, carrot, beet) contain more starch and don't fit well. See the complete keto food list.
8Can you eat rice or pasta on keto?
No, not the regular kind. A serving of white rice contains around 45 grams of carbs, pasta is similar. Alternatives: cauliflower rice, zucchini noodles, or shirataki noodles (almost 0 grams of carbs).
9Can you eat bread on keto?
Regular bread no, a slice contains 12 to 15 grams of carbs. There are keto bread recipes using almond flour or flaxseed with 1 to 2 grams per slice. Bake your own or buy keto bread at a specialty store.
10Can you eat dairy on keto?
Yes, most dairy fits fine. Butter, cream, cheese (hard and soft), and full-fat yogurt contain few carbs. Watch out for milk (12 grams of carbs per glass) and low-fat yogurt (often added sugar).
11Can you eat nuts on keto?
Yes, but in limited amounts. Best options: macadamia, pecans, and walnuts (lowest carbs). Cashews and pistachios contain more carbs, so small portions. Note: nuts are calorie-dense, a handful is quickly 200 calories.
12Can you drink coffee on keto?
Yes, black coffee contains almost 0 carbs. Add cream or butter (bulletproof coffee) if you want. No sugar, limited milk. Coffee can even help with fat burning and appetite suppression.
13Can you drink alcohol on keto?
Technically yes, but choose wisely. Dry wine (1 glass, around 2 grams of carbs) or hard liquor straight (whiskey, vodka, gin, 0 grams of carbs) are the best options. Beer and cocktails contain too much sugar. Note: alcohol temporarily slows fat burning and your tolerance is much lower on keto.
Not sure what you can eat?
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The right ratios and practical tips for your daily eating pattern.
14How much protein should you eat on keto?
Aim for 0.5 to 0.9 grams of protein per pound of body weight. Too little costs muscle, too much can disrupt ketosis in some people. For most people, 80 to 130 grams per day is a good range.
15What are the best fats for keto?
Extra virgin olive oil, coconut oil, butter, avocado oil, and ghee. Plus fat from natural sources: fatty fish, avocado, nuts, and cheese. Avoid trans fats and refined seed oils (sunflower oil, soybean oil).
16How much water should you drink on keto?
At least 2 to 3 liters per day. On keto, you lose more water than usual due to lower insulin. Drink water throughout the day, not all at once. Add salt to your water or drink bouillon for electrolytes.
17Do you have to count calories on keto?
Not necessarily at the start. Keto suppresses hunger naturally, so most people eat less automatically. If weight loss stalls, tracking calories can help spot where it's stuck. Focus on the right foods first, numbers later.
18What do you eat for breakfast on keto?
Classics: eggs (fried, scrambled, omelet) with bacon or avocado. Full-fat yogurt with a few nuts. Bulletproof coffee if you're not a breakfast person. Or nothing at all: intermittent fasting pairs well with keto.
19What are common mistakes on keto?
The top five: 1) Not enough salt and electrolytes. 2) Not enough protein. 3) Too many keto snacks and fat bombs. 4) Not enough vegetables. 5) Counting everything except sauces, dressings, and drinks. Avoid these and your results will be much better.
Health and safety
Important questions about cholesterol, kidneys, and who keto is (not) suitable for.
20Is keto bad for your kidneys?
For healthy kidneys, there's no evidence keto is harmful. Keto is not an extreme high-protein diet, which is the most common misconception. If you already have kidney disease, talk to your doctor first.
21Does keto raise your cholesterol?
For most people, the lipid profile improves: HDL (good cholesterol) goes up, triglycerides go down. In a small percentage, LDL rises. Get your blood checked after 3 months and discuss the results with your doctor.
22Is keto safe for women?
Yes, with caveats. Some women notice changes in their menstrual cycle in the first months. That usually stabilizes. Pregnant and breastfeeding women shouldn't follow keto without medical supervision.
23Is keto suitable for type 2 diabetes?
Keto can help with type 2 diabetes by lowering blood sugar and improving insulin sensitivity. Multiple studies support this. But: always do it under medical supervision, because your medication likely needs adjustment.
24What is keto flu and how do you prevent it?
A cluster of symptoms (headache, fatigue, nausea) in the first few days caused by mineral loss. Prevent it by adding extra salt, magnesium, and potassium from day 1 and drinking enough water. Read the full plan in keto flu: what to do.
25Can keto help with more energy?
Yes, many people report steadier energy throughout the day. No more sugar crashes after meals, no afternoon slump at 3 PM. The first 1 to 2 weeks you may actually be tired (adjustment period), but after that most people feel a clear improvement.
Practical questions
The daily reality: cost, exercise, cheat days, and how long to keep going.
26Can you exercise on keto?
Yes, but expect less performance the first 2 to 4 weeks. Your body has to learn to use fat as fuel. After that, endurance recovers and many people perform better long term. Strength training works well on keto, high-intensity sprint sports are tougher. More details in keto and exercise.
27Can you do keto as a vegetarian?
Yes, but it requires more planning. Eggs, cheese, nuts, avocado, olive oil, tofu, and tempeh are your basis. Getting enough protein is the hardest part. Fully vegan keto is possible but quite limited in choice.
28What if you had a cheat day?
Don't make a drama of it. You're temporarily out of ketosis, but you'll be back within 1 to 3 days if you eat strictly. Expect some water retention (scale goes up briefly, that's water, not fat). Just keep going, no punishment needed.
29How long should you stay on keto?
There's no fixed term. Some people eat keto for years, others do 3 to 6 months to lose weight and then switch to low carb. Give it at least 4 to 6 weeks before judging whether it suits you.
30Is keto expensive?
It doesn't have to be. Eggs, butter, fatty fish, seasonal vegetables, and nuts aren't more expensive than an average grocery basket. You save on bread, pasta, rice, snacks, and soda. It only gets expensive if you only buy organic meat and special keto products, which isn't necessary.
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