Carnivore Diet and Vitamin C: Understanding the Real Scurvy Debate

# Carnivore Diet and Vitamin C: Should You Really Fear Scurvy?

**by Laurent Glatz – for Athletic Carnivore**

"Without fruits or vegetables, you'll lack vitamin C." This is probably one of the most repeated objections whenever the carnivore diet is discussed. The reasoning seems airtight: humans no longer synthesize their own vitamin C, plants contain a lot of it, meat contains relatively little, so removing plants should mechanically lead to deficiency and then scurvy.

Yet human physiology rarely works as a simple sum of milligrams.

Yes, vitamin C is essential. Yes, unlike most mammals, humans must obtain it from their diet. And yes, current American recommendations are 90 mg per day for adult men and 75 mg for women, with an additional 35 mg recommended for smokers.

But a nutritional recommendation, a threshold to avoid a deficiency disease, and the actual amount used by an organism in a given metabolic context are three different questions.

And this is precisely where the subject becomes much more interesting.

Scurvy Doesn’t Start at 89 mg

A common confusion is to treat recommended intakes as a kind of biological boundary: 90 mg is sufficient, 80 mg is already worrying, and zero fruit almost automatically means scurvy.

It doesn’t work that way.

Available data indicate that very low intakes, around 10 mg of vitamin C per day, can be enough to prevent clinical scurvy. This absolutely does not mean that 10 mg is an "optimal" intake. It simply shows something fundamental: **the threshold to prevent severe deficiency is far below the several hundred milligrams sometimes mentally associated with vitamin C.**

The video precisely starts from this distinction: humans undeniably need vitamin C, but the real question then becomes how much is necessary and especially how the body uses this vitamin.

And when you ask the question this way, the "orange versus steak" debate becomes far too simplistic.

An Arctic Tale Worth Telling Properly

In the 19th century, scurvy was still a significant threat to polar expeditions. One of the most fascinating accounts comes from American physician and explorer **Elisha Kent Kane** during the second Grinnell expedition from 1853 to 1855, which ventured into the Arctic searching for traces of the Franklin expedition.

His ship became trapped in ice. The cold, darkness, exhaustion, and the gradual disappearance of fresh food were accompanied by a true health disaster. Kane describes a situation where almost the entire crew suffered from scurvy, with many men unable to leave their bunks.

And there were the rats.

Kane recounts that rats had become so numerous aboard that they destroyed clothes, shoes, and provisions. He eventually consumed them himself. But the historically much stronger element than the rat anecdote is his repeated observation regarding **fresh meat**. Kane emphasized its importance in preventing and treating scurvy, to the point that his observations are now mentioned in his scientific biography.

Of course, this was not a controlled clinical trial. It’s impossible to deduce the exact amount of vitamin C needed by a modern carnivore.

But this story already dismantles a too-simple idea: during periods when fresh fruits and vegetables were practically absent, consuming fresh animal tissues could help prevent scurvy.

The interesting question is no longer: "Where do you find the most vitamin C on a nutritional table?"

It becomes: **how much do you absorb, how does the body transport it, and above all, what does it do with this vitamin once it enters its cells?**

Because Vitamin C Doesn’t Simply Disappear After Use

This is probably the most interesting mechanism to understand the carnivore debate.

Vitamin C mainly circulates in a reduced form called ascorbate. This form uses two specific transporters called **SVCT1 and SVCT2**. When oxidized, it can become **dehydroascorbate**, or DHA. This form doesn’t follow exactly the same path: several transporters from the GLUT family, notably GLUT1, GLUT3, and in some tissues GLUT4, can participate in its transport.

But here’s the often-forgotten point: this DHA can then be **reduced back to ascorbate**.

In other words, an oxidized vitamin C molecule is not automatically a lost molecule.

Cellular systems allow its recycling, and **reduced glutathione, or GSH**, participates in these reactions. Red blood cells, for example, can capture DHA and quickly convert it back to ascorbate thanks to mechanisms dependent on glutathione.

And glutathione itself has an interesting feature: it’s a tripeptide synthesized from three amino acids—glutamate, cysteine, and glycine.

This is where the carnivore hypothesis begins.

Does High Protein Mean More Recycling?

A diet rich in animal products abundantly provides the amino acids used by the body for various protein syntheses, including those involved in the glutathione system.

It is therefore biologically reasonable to wonder if, under certain conditions, a different availability of these precursors can influence redox capacity and indirectly the vitamin C economy.

But we must stop exactly where the data stop.

**Plausible does not mean proven.**

We currently have no clinical evidence to affirm that a carnivore produces enough more glutathione to quantitatively reduce its dietary vitamin C needs. The video made precisely this distinction between what is established and what remains extrapolation.

And this is important, because turning an appealing physiological hypothesis into certainty would be committing exactly the error often reproached to conventional nutrition.

And What About Glucose?

The subject becomes even more subtle when we discover that DHA can use some GLUT transporters also involved in glucose transport.

Competition between glucose and DHA exists in some experimental systems. But this does not allow a simple conclusion: "The less carbs I eat, the better I absorb my vitamin C."

The reality depends on the transporter, the tissue, the concentrations present, and the metabolic state. Some data even show that certain GLUTs have a strong affinity for DHA.

The idea that a low-carb environment could modify vitamin C economy is therefore scientifically interesting.

**What is still missing is proof that this actually reduces the daily requirement in humans following a carnivore diet, and by how much.**

This is probably the real scientific question.

Your Need Doesn’t Exist in a Vacuum

Finally, there is a particularly revealing detail: needs are already not considered identical for everyone. Smoking, for example, is associated with more oxidative stress and lower vitamin C concentrations; this is precisely why official recommendations add 35 mg per day for smokers.

This does not prove that a carnivore diet decreases needs.

But it demonstrates something much more important: **vitamin C utilization depends on physiological context.**

Oxidative stress, smoking, inflammation, diet, physical activity, metabolic state, food quality, cooking, digestion, and recycling capacity are not imaginary variables.

That’s why comparing only the milligrams contained in an orange with those in an animal food is not enough to describe the full physiology.

And it’s also why two people both eating "carnivore" don’t necessarily experience the same situation.

A person eating mainly fresh animal foods doesn’t necessarily have the same terrain as someone living on heavily cooked or processed products. A highly active athlete doesn’t have the same context as a sedentary individual. A smoker doesn’t have the same oxidative stress as a non-smoker.

The dietary direction can be the same. **The terrain, however, is never completely identical.**

This is where generic advice reaches its limit.

You can spend weeks wondering whether to add vitamin C, remove something, increase something else, or copy what a carnivore on the internet does. But if you don’t know which parameter is truly relevant in your own case, you risk simply adjusting what didn’t need adjustment.

The strongest scientific position today is ultimately much more interesting than a slogan: humans need vitamin C; ascorbate and DHA have different transport mechanisms; DHA can be recycled; glutathione participates in this recycling; and several characteristics of a carnivore diet legitimize the question of a different metabolism of this vitamin. However, **we do not yet have data to quantify a specific vitamin C requirement in humans following a carnivore diet long-term.** This is precisely the boundary the video wanted to maintain between facts and extrapolations.

Absence of evidence is not evidence of absence. But an appealing hypothesis is not proof either.

And between the two lies exactly what interests us: understanding biology before turning an idea into a universal rule.

**If you follow a carnivore diet and something isn’t responding as expected, the question may no longer be to seek additional advice. It is to understand your terrain, your actual diet, and the signals your body sends you.**

**Do you really have a vitamin C problem… or are you applying to your own metabolism a response designed for a situation you never analyzed?**

**Understanding What Applies to My Case**

#CarnivoreDiet #VitaminC #Scurvy #Nutrition #LowCarb #Metabolism #Glutathione #MetabolicHealth #AthleticCarnivore