How to start

The cleanest way to start is as a 30-day experiment, not a permanent identity change. Thirty days is long enough to clear the adaptation phase and tell whether the diet does anything for you, and short enough that the commitment feels small.

Decide on a start date, clear the kitchen of foods that will tempt you in week one, and start. That is most of it.

Week one shopping list

Enough for one person for seven days, around AUD 70-100 from a supermarket. Adjust quantities up for a household.

• 2 kg beef mince (a flexible base for most meals)
• 1 kg ribeye or chuck steak
• 500 g bacon or pork belly
• 2 dozen eggs
• 500 g butter
• Salt (any unrefined option is fine)
• Optional: hard cheese, sour cream, plain yoghurt

Cook in butter or rendered animal fat. No seed oils, no marinades.

How much to eat

Eat to satiety. No calorie counting in the first month. Most people land between 1.5 and 2.5 lb (700-1200 g) of meat per day, plus fat. If you are hungry an hour after a meal, the meal was too lean. Add fat.

Two meals a day is common. Three is fine. If you stop being hungry mid-morning you can drop to one meal a day, but do not force it in week one.

Salt and water

This is the single most underrated mistake people make. When you cut carbs hard, your kidneys dump sodium. If you do not replace it, you get the symptoms people blame on "keto flu" or "the adaptation": headaches, fatigue, light-headedness, leg cramps, brain fog.

• Salt your food more aggressively than feels normal. Aim for 5-7 g of added sodium per day.
• Drink to thirst, not on a schedule. Forcing water dilutes electrolytes and makes things worse.
• If you feel awful in days 3-7, add a glass of water with 1/4 teaspoon of salt. Symptoms usually clear within an hour.

What to expect

1. 01Days 1-3. Easy. You are still running on glycogen.
2. 02Days 4-10. The adaptation window. Energy dips, sleep can get weird, mood may wobble. Salt and patience.
3. 03Days 11-21. Most people turn a corner here. Steady energy, clearer thinking, less hunger between meals.
4. 04Days 22-30. Baseline. This is what your "post-adaptation" normal looks like. Make your call.

Full detail of the adaptation phase at Side effects and what to expect.

What to monitor

You do not need a lab. You need a notebook. Track three things daily:

• Energy from 1-10 at three points: morning, lunchtime, evening
• Sleep quality and total hours
• Bowel function (frequency, comfort)

Weight is the worst signal in the first month because the early loss is mostly water. Weigh weekly at most, ideally not at all.

Common mistakes

• Going too lean. Chicken breast and 95% mince will leave you hungry and tired. Aim for 70/30 mince, ribeye, ribs, pork belly.
• Under-salting. See above. Almost every "this diet made me feel awful" story is actually an electrolyte story.
• Cheating in week two. The adaptation resets every time. One cheat day in week two means starting over.
• Adding "carnivore-friendly" extras (zero-carb sweeteners, sugar-free electrolyte powders with sucralose). Most defeat the elimination point.
• Tracking macros from day one. Track sleep and energy. Macros come later if you need them.

When to consult a doctor first

If you are on insulin, blood pressure medication, or psychiatric medication, the diet will change your numbers within days. Your doctor needs to know so they can adjust dosages. The diet is not the problem; medications that were calibrated to a different metabolic state will be.

If you have a history of disordered eating, talk to someone before you start. The structure of carnivore (clear "yes" and "no" lists, no calorie counting) is helpful for some people and a trap for others.

Where to go next

• Stuck on what to actually buy? Full food list
• Worried about side effects? Side effects and what to expect
• Want quick answers? Frequently asked questions