This post may contain affiliate links. For educational purposes only, not medical advice. Details
You get up from the couch, the room tilts for a second, and you grab the counter. If you're a few weeks into carnivore and over 60, that head rush on standing is one of the most common things people describe. It usually comes from losing fluid and sodium faster than your body is used to, which lets your blood pressure dip for a few seconds when you go from sitting to standing.
It's usually fixable with salt, fluid and a few habits. But take it seriously at our age, because a dizzy spell can turn into a fall.
Why standing up is the moment it hits
When you stand, gravity pulls blood down into your legs. Normally your blood vessels tighten and your heart speeds up a little, so you never notice it.
Early on carnivore, a few things make that catch slower. Insulin drops when carbs drop, and lower insulin tells your kidneys to let go of sodium and water. That's much of the 3-7 lb water drop many people see in week one. Less fluid in your blood vessels means less of a buffer when you stand. After 60, our reflexes are a bit slower too, so you feel the gap.
That's why it tends to show up in specific moments: first thing in the morning, getting out of a hot bath, standing after a big meal, or getting up fast when the phone rings. If you want a starting point for your daily protein and fat numbers while you sort this out, the free carnivore macro calculator takes a couple of minutes.
If you take blood pressure medicine, read this part twice
Many readers on blood pressure medicine find their pressure comes down as they lose weight and shed water on this way of eating. The dose was set for the old you, so it can now push you lower than intended, and standing up is where you feel it first.
We cover the bigger picture in what to do when carnivore drops your blood pressure too low. The short version: any change to your medicine is your prescriber's decision. Your job is to bring them good information, fast.
What's most useful is a sitting-and-standing log. With a home cuff:
- Sit quietly for 5 minutes, then take a reading and write it down with the time.
- Stand up, and take another reading at 1 minute and again at 3 minutes. Note how you feel at each one.
- Do this morning and evening for about a week, plus any time you feel the head rush.
- Note the context: when you took your pills, your salt and fluid, any hot shower.
Doctors generally pay attention when the top number drops by 20 or more, or the bottom number by 10 or more, within a few minutes of standing. Bring the log and call sooner rather than waiting for your next routine visit.
What people on the diet typically do about it
For most people, the biggest lever is salt. Most people on carnivore land around 3-5 g of sodium a day, which is roughly 1.5-2 teaspoons of salt (1 teaspoon is about 2.3 g of sodium), spread through the day instead of all at dinner. This is not for everyone. Talk to your doctor first if you have high blood pressure, kidney or heart problems, diabetes, are pregnant, or take medicine.
I under-salted for months when I started, out of decades of habit, and it's the mistake I'd most like you to skip. Here's what else tends to help:
- Salt in the morning. Salted bone broth or a pinch of salt in water before you start moving covers the worst time of day.
- Drink to thirst, steadily. Regular sips, not gallons, which can wash sodium out faster.
- Eat enough. Under-eating in the early weeks makes everything worse. Ground beef and eggs count.
- Potassium from food first. Beef has about 300-400 mg per 4 oz, and meat plus broth covers most people. We don't give a potassium target, because too much is dangerous and blood pressure medicine and kidney function change the answer. That's a question for your doctor or pharmacist.
- Magnesium, if you use it. People usually pick glycinate in the evening and avoid oxide, which absorbs poorly. Ask your pharmacist for the amount, since your kidneys and your medicines both affect what's safe.
For the full sodium, potassium and magnesium picture, our guide to salt when you take blood pressure pills goes deeper. KetoDial covers the same mechanism in its early-week electrolyte fix.
How to get up so you don't go down
- Get up in stages. Sit on the edge of the bed for 30 seconds, feet on the floor, before you stand.
- Pump your calves first. Flex your ankles ten times while seated to push blood back toward your heart.
- Be careful after heat. Hot showers, baths and hot tubs open up your blood vessels. Up here in Whistler, the après hot tub catches a lot of people.
- Clear the night path. A nightlight and nothing on the floor between bed and bathroom.
For most people, the head rush fades as the body adjusts, usually over weeks 4-6. If you're well past that and it's still happening, or it's getting worse, that's a reason to call your doctor, not to push through.
See a doctor now, or call emergency services, if
Some dizziness isn't about salt at all. Call 911 or your local emergency number if you have:
- Fainting or blacking out, even briefly
- Chest pain, pressure or tightness
- Weakness or numbness on one side of your face, arm or leg
- Slurred speech, confusion, or trouble understanding words
- Sudden vision loss or double vision
- A sudden, severe headache unlike any you've had
- An irregular, racing or pounding heartbeat, or a very slow one
- Shortness of breath along with the dizziness
- A fall where you hit your head, especially if you take a blood thinner
See your doctor soon (same day or next) if the room spins even when you're lying still, if you have black or bloody stools, if you can't keep fluids down, or if your home readings keep coming in low.
If you live alone, tell someone you're starting this way of eating and keep your phone on you, not on the charger across the room.
I'm not a doctor. I'm a writer who has spent years reading the research at my kitchen table and talking with readers who've been through this. Everything here is education, not a diagnosis. Your situation might be different, and your doctor knows your whole picture.