How do I start the keto diet?

Start by cutting net carbs to 20-50g per day. Build every meal around protein and healthy fats — eggs, meat, fish, cheese, low-carb vegetables, nuts, and oils. Cut out sugar, grains, and starches, drink plenty of water with electrolytes, and track your net carbs each day.

What can I eat on keto?

Eat eggs, meat, poultry, fatty fish, cheese, healthy fats like olive oil and avocado, low-carb vegetables such as spinach and broccoli, and nuts and seeds. Berries fit in small portions. Avoid bread, pasta, rice, sugar, and starchy vegetables.

How long does it take to get into ketosis?

Most people reach ketosis in 2-4 days once net carbs are consistently under 20-50g per day. Staying low-carb, active, and well-hydrated helps you get there faster and stay there.

What should I avoid on keto?

Avoid sugar, soda, juice, bread, pasta, rice, grains, potatoes and other starchy vegetables, and most fruit. Watch hidden carbs in sauces, dressings, and 'low-fat' packaged foods, which often add sugar.

Is keto safe for beginners?

Keto is generally well tolerated, but it is a big change. Drink water with electrolytes to ease the early 'keto flu,' eat enough protein and fat to stay satisfied, and check with your doctor first if you take medication or have a health condition.

Keto for Beginners: A Simple 7-Day Starter Guide

Keto for beginners made simple: cut carbs to 20-50g, learn what to eat, beat the keto flu, and follow a 7-day starter meal plan to reach ketosis.

To start keto, cut your carbs to about 20-50g net per day, build meals around protein and healthy fats (meat, eggs, fish, cheese, low-carb veggies, nuts, and oils), and cut out sugar, grains, and starches. Drink plenty of water with electrolytes, and track your net carbs every day. Most people reach ketosis in 2-4 days.

Keto sounds complicated, but the beginner version is simple: eat real food, keep carbs low, and pay attention to net carbs. This guide walks you through exactly what to do for your first week, including a ready-to-use meal plan.

Your 7-day keto starter meal plan

You don't need fancy recipes to start. Here's a full week of simple, low-carb meals you can mix and match.

Day	Breakfast	Lunch	Dinner
1	Scrambled eggs with cheese	Chicken Caesar salad (no croutons)	Salmon with roasted broccoli
2	Greek yogurt with chia seeds	Tuna salad lettuce wraps	Beef stir-fry with peppers
3	Omelet with spinach and feta	Burger patty with avocado, no bun	Pork chops with sautéed zucchini
4	Bacon and eggs	Cobb salad with ranch	Baked chicken thighs with cauliflower mash
5	Cottage cheese with walnuts	Egg salad on cucumber slices	Steak with garlic butter green beans
6	Keto smoothie (avocado, spinach, almond milk)	Grilled chicken over mixed greens	Shrimp and sausage skillet
7	Cheese and veggie frittata	Leftover steak salad	Roast chicken with asparagus

Snacks between meals: a handful of almonds, string cheese, olives, hard-boiled eggs, or a few slices of avocado.

What is the keto diet?

The keto (ketogenic) diet is a very low-carb, higher-fat way of eating. When you keep carbs low enough, your body runs low on its usual fuel (glucose) and switches to burning fat for energy instead. Your liver turns that fat into molecules called ketones — that fat-burning state is called ketosis.

In plain terms: you eat fewer carbs, more fat, and a moderate amount of protein. That shift is what makes keto popular for steady energy and appetite control. If you want a fuller picture of what's allowed, see our complete keto food list.

Step 1: Set your carb limit

The single most important rule of keto is your daily carb limit. Most beginners aim for 20-50g of net carbs per day.

Net carbs = total carbs minus fiber (and most sugar alcohols).
Start at 20-30g if you want to reach ketosis quickly.
40-50g is a gentler entry point that's easier to stick to long term.

This is a small budget, so it fills up fast. A single slice of bread or a banana can use most of it. That's why tracking matters from day one — guessing almost always means going over. The easiest way to stay under your limit is to scan or search foods in CarbMeNot, which shows your net carbs as you go.

Step 2: Know what to eat (and avoid)

You don't need to memorize a long list. Build plates from the "eat" column and steer clear of the "avoid" column.

Foods to eat:

Eggs, beef, chicken, pork, and lamb
Fatty fish like salmon, sardines, and mackerel
Cheese, butter, heavy cream, and full-fat Greek yogurt
Healthy fats: olive oil, avocado, avocado oil
Low-carb vegetables: spinach, broccoli, cauliflower, zucchini, asparagus, peppers (see the lowest-carb vegetables)
Nuts and seeds: almonds, pecans, macadamias, chia, flax
Berries in moderation — here are the best keto-friendly fruits

Foods to avoid:

Sugar, soda, juice, candy, and desserts
Bread, pasta, rice, oats, and other grains
Potatoes and starchy vegetables (corn, peas)
Most fruit (bananas, apples, grapes, mango)
"Low-fat" packaged foods that sneak in sugar
Hidden carbs in sauces, dressings, marinades, and breaded foods

When you're stuck for ideas in the morning, these low-carb breakfast ideas make it easy.

Step 3: Handle the keto flu

In your first week, you might feel tired, headachy, or irritable for a couple of days. This is the keto flu, and it's usually not the diet "not working" — it's your body shedding water and minerals as it switches fuels.

The fix is simple: replace what you're losing.

Drink more water than usual.
Add electrolytes: sodium (salt your food or sip broth), potassium, and magnesium.
Don't fear salt in the first weeks — it helps a lot.
Eat enough fat and protein so you're not running on empty.

Most people feel noticeably better within a few days. If you ease in and stay hydrated, you may barely notice it.

Step 4: Track everything

Tracking is the habit that separates people who reach ketosis from people who stall. Carbs hide everywhere — in a "healthy" smoothie, a spoonful of ketchup, a handful of crackers. If you're not logging, you're guessing.

This is exactly what CarbMeNot is built for. As a beginner you can snap a photo of your meal or search a food, and it instantly estimates your net carbs and macros so you know whether something fits your limit before you eat it. You can also browse our food carb database to look up carb counts for thousands of foods. Tracking for even one week trains your eye for what 20-50g really looks like.

Your first week on keto

Here's the simple plan for week one:

Pick your carb limit (start around 20-30g net).
Clear out the obvious carbs — bread, pasta, sugary snacks, soda.
Stock the basics: eggs, meat, fish, cheese, leafy greens, olive oil, nuts.
Follow the 7-day meal plan above, swapping meals you like.
Salt your food and hydrate to dodge the keto flu.
Log every meal in CarbMeNot so you stay under your limit.

Expect to reach ketosis within 2-4 days. You may notice steadier energy and less hunger by the end of the week. Don't chase perfection — consistency beats a flawless single day.

Start tracking from day one

The biggest beginner mistake is going over your carb limit without realizing it. CarbMeNot removes the guesswork: snap a photo or search a food, see your net carbs instantly, and stay under your target every day. It's the easiest way to make keto stick in your first week — download CarbMeNot and start tracking from day one.

Key takeaways

Keep net carbs to 20-50g per day — that's the core rule of keto.
Build meals from protein, healthy fats, and low-carb vegetables; cut sugar, grains, and starches.
Beat the keto flu with water and electrolytes (especially salt).
Most people reach ketosis in 2-4 days of staying low-carb.
Track every meal with CarbMeNot so you never go over your limit by accident.