To start the carnivore diet, get baseline bloodwork, clear plant foods from your kitchen, and eat fatty meat, eggs, and butter until full. Expect an adaptation phase ("carnivore flu") in days 3–10 (manage it with salt, magnesium, and bone broth) then commit to a 30-day trial before judging results.
The carnivore diet has one of the simplest rules of any diet: eat only animal products. No fruits, no vegetables, no grains. Just meat, eggs, and some dairy if you tolerate it. Simple to understand, not always easy to execute in the first two weeks.
This guide walks you through exactly how to start, step by step, so you avoid the mistakes that make most beginners quit in the first week. Follow it in order and you'll give yourself the best possible chance of getting through the adaptation phase and actually seeing results.
Step 1: Get bloodwork done first
Before you change anything, visit your doctor and get a full blood panel: cholesterol (full lipid panel), glucose, insulin, kidney function, vitamin D, and magnesium. This gives you a baseline to compare against at 90 days. Don't skip this step. The data will be invaluable, and it's the single best way to know objectively whether the diet is working for your body.
Why this matters so much: the carnivore diet produces changes that you can't feel: your cholesterol profile, fasting glucose, and inflammatory markers all shift (the 2021 Harvard-affiliated survey documented exactly these changes. Improved triglycerides and HDL alongside elevated LDL). Without a baseline, you're guessing. With one, you have hard evidence at 90 days showing exactly what changed. If you've ever been told you have prediabetes, high triglycerides, or metabolic issues, this before-and-after comparison is the most valuable thing you'll get from the entire experiment.
Step 2: Clear your kitchen
Remove temptations. Donate or store bread, pasta, snacks, sweets, and anything processed. The first two weeks are about removing friction, if there's no easy carb-heavy snack in the cupboard at 9pm, you won't eat it.
Stock up on what you'll eat: ribeye steaks, ground beef (80/20), eggs, butter, bacon, and bone broth. Buy more than you think you need. Running out of food on day 4 and ordering a pizza is one of the most common ways people fail in the first week. Having the right food available removes all decision fatigue and makes sticking to the diet almost automatic.
Step 3: Plan your first week
Not sure how much to eat? Use our free carnivore diet calculator to estimate your daily calories, protein, and fat from your body and goals.
Keep it simple. You don't need recipes or variety in the first week. You need consistency and enough food. Here's a template that works:
- Breakfast: 3–4 eggs scrambled in butter + 2–3 bacon strips
- Lunch: 200g ground beef patties + generous salt
- Dinner: Ribeye steak cooked in butter + cup of bone broth
- If hungry: Hard boiled eggs or more ground beef
Eat to satiety. This is not a calorie-restriction diet. If you're hungry, eat more. Most people naturally eat less after the first week because protein and fat are far more satiating than carbs, but in the early days you should never let yourself go hungry. Hunger is what drives people back to old foods.
Don't worry about eating the same thing every day. Simplicity is a feature, not a bug. It removes decisions and makes the first week effortless once your kitchen is stocked.
Step 4: Manage the adaptation phase
Days 3–10 will be the hardest. This is the "carnivore flu", similar to keto flu, and it's completely normal. Your body is switching from glucose to fat as its primary fuel source, and during that transition your kidneys flush out water and electrolytes faster than usual. That electrolyte loss is what causes the headaches, fatigue, and brain fog. Here's how to get through it:
- Add 1–2 teaspoons of salt to your food and water daily
- Take 300mg magnesium glycinate before bed
- Drink a cup of bone broth daily
- Eat enough fat, don't restrict calories
- Drink enough water, but don't overdo plain water as it dilutes electrolytes further
The single biggest mistake people make here is under-salting. On a normal diet, processed food contains huge amounts of hidden sodium. When you cut all of that out, you have to add it back deliberately. If you feel a headache or fatigue coming on, a cup of salted bone broth often resolves it within an hour. Don't fear the salt. It's the most important tool you have in week one.
🛒 Shopping List for Week 1 2kg ground beef (80/20) · 2 ribeye steaks · 500g bacon · 24 eggs · 250g butter (grass-fed if possible) · 200g beef liver · 1 litre bone broth · Sea salt · Magnesium glycinate supplement
Common mistakes that make beginners quit
Most people who fail on carnivore don't fail because the diet doesn't work. They fail because of avoidable mistakes in the first two weeks:
- Not eating enough fat. Lean meat alone will leave you hungry and low energy. You need fatty cuts, ribeye, 80/20 ground beef, eggs, butter.
- Under-salting. The number one cause of carnivore flu symptoms. Salt aggressively.
- Restricting calories. Eat to fullness. Hunger drives relapse.
- Quitting during adaptation. Days 3–10 feel bad. That's the transition, not the destination.
- Weighing yourself daily. Water weight fluctuates wildly in the first weeks. Judge by how you feel, not the scale.
What to expect week by week
Knowing what's coming makes it far easier to push through. Here's the rough timeline most people experience:
- Days 1–2: Often feel fine, even good. The honeymoon before adaptation.
- Days 3–10: The hard part. Carnivore flu, low energy, cravings.
- Days 11–21: Energy starts to stabilize. Cravings fade. Appetite drops.
- Days 22–30: Mental clarity, steady energy, and the first visible results.
Step 5: Commit to 30 days
Don't judge the diet before 30 days. Most benefits appear in weeks 3 and 4. Energy improves, appetite stabilizes, and mental clarity returns. Many people want to quit in week one, when they're in the depths of the adaptation phase and haven't yet felt any upside. Push through it. Judging carnivore by how you feel on day 5 is like judging a workout program by how sore you are the morning after the first session.
Make the commitment concrete: pick a start date, mark day 30 on your calendar, and decide in advance that you won't evaluate the diet until you reach it. This single mental shift (treating it as a fixed 30-day experiment rather than an open-ended choice you re-make every day) is what separates the people who succeed from the people who quit.
Step 6: Retest at 90 days
Go back to your doctor at 90 days and repeat the same blood panel. Compare the numbers against your baseline. Most people see improved triglycerides, improved HDL, better fasting glucose, and meaningful weight loss. One number that often rises is LDL cholesterol. This is common on carnivore and worth discussing with your doctor in the context of your full lipid panel, not in isolation. Another reading that sometimes surprises people is a higher fasting blood glucose, which is usually a benign adaptation rather than a warning sign.
Use this data to make an informed decision about whether to continue long term. The beauty of the 90-day blood test is that it removes guesswork. You'll know objectively what the diet did to your body, not just how you felt. For a deeper look at what to expect month by month, see our guide on carnivore diet results after 30, 60 and 90 days.
Quick Start Summary
Get bloodwork → Clear your kitchen → Eat ribeye, eggs, butter, bone broth → Survive the first 10 days with salt and magnesium → Reassess at 30 days. That's it. The rules are simple. Execution just takes commitment.