Why Homocysteine Rises on a Lean Carnivore Diet

Why Homocysteine Rises on Carnivore: What Some Australian Experts Haven't Yet Seen in Practice
by Laurent Glatz – for Athletic Carnivore

You’ve adopted the carnivore diet. You’ve eliminated plants, carbs, and vegetable oils. You eat meat, eggs, and butter. Yet somewhere between the third and sixth month, a discomfort sets in. It’s not hunger. It’s not a lack of salt. It’s a diffuse mental fatigue, a heaviness after meals, a feeling that your body isn’t recovering despite a plate perfectly free of plant toxins. You may have even tested your homocysteine levels. And they’re elevated.

At this stage, most medical advice will tell you to monitor your B vitamins, eat liver, and supplement with folate. That’s not wrong. But it might not be the main cause. What field experience shows, and what some advanced readings are only beginning to touch on, is that homocysteine often rises because the carnivore plate is too lean. Not because it lacks vegetables. Because it lacks fat.

Dr. Deepa Mahananda is not an isolated voice. Graduated from Western Sydney University Medical School in 2012, having completed her junior medical training at Concord, Canterbury, and Broken Hill, she is now a board director of the Australasian Metabolic Health Society (AMHS), an independent organization founded in July 2023 with over two hundred members already. Alongside Dr. Alex Petrovski, she co-founded the Sydney Low Carb Specialists clinic. The AMHS recently published a case study in the Royal Australian College of General Practitioners, the leading journal for Australian GPs, demonstrating that therapeutic carbohydrate reduction is a frontline option for metabolic syndrome, hyperinsulinemia, and fatty liver disease. This is a major institutional breakthrough.

It is precisely in this context that the AMHS raised, during its scientific Grand Rounds, the issue of homocysteine in carnivore practitioners. The message was clear: watch this marker. Meat is rich in methionine, and without the right cofactors, homocysteine can rise. But where many stop reading, the field begins. Because the real question isn’t just whether you eat enough liver or enough B12. The real question is how you compose your meat plate. More precisely, what is the ratio between the protein you eat and the fat you eat.

The central mechanism is metabolic, not just vitamin-related. Red meat and eggs naturally provide a lot of methionine, an essential sulfur-containing amino acid involved in the methionine-homocysteine cycle. When you eat meat, this methionine is metabolized into homocysteine in the liver. Normally, the body recycles this homocysteine either by remethylation or transsulfuration. But this recycling depends on the load presented to the liver. If your carnivore plate is dominated by lean proteins—chicken breasts, overly trimmed steaks, eggs without yolks—you flood your metabolism with a massive methionine influx without the lipid context that allows the liver to manage this flow smoothly. Animal fat is not just a calorie source. It modulates the insulin-glucagon response, slows amino acid absorption, and gives the liver the time and conditions to recycle methionine efficiently. When the fat-to-protein ratio is skewed toward lean, the liver is overwhelmed. Homocysteine accumulates not because you lack folate, but because the recycling machinery is saturated by a protein load too rapid and concentrated for the available fat.

This changes everything. Because it means two people can adopt carnivore and get opposite results on the same marker. One composes meals with fatty cuts, marbled beef, duck fat, butter, egg yolks. Their homocysteine remains stable or even improves because the liver receives methionine in a modulated flow, with the fatty acids needed to maintain slow oxidation and a hormone balance compatible with recycling. The other, convinced that more lean protein equals more muscle and less body fat, eats overly trimmed steaks, avoids yolks, fears fat. Their homocysteine rises. They develop fatigue, brain fog, that diffuse inflammation no one can name. Same carnivore protocol. Two plates. Two metabolisms. Two destinies.

Individual variability is not limited to your MTHFR polymorphism or your ability to absorb B12. It starts with how you build your plate. Your carbohydrate history, insulin sensitivity, and lipid oxidation capacity play a role, of course. But the most immediate and powerful lever remains meal composition. A carnivore who is too lean is not an optimized carnivore. It’s a disguised hyper-protein diet, and the body reacts to this overload as it would to any excess: by accumulating metabolic intermediates you don’t know how to read but you feel.

The cost of staying in the dark is exactly this. You keep adjusting your macros, searching for the magic supplement, wondering if you should reintroduce vegetables for folate, or panicking over a high homocysteine level. Meanwhile, the real problem may simply be that your plate is too lean. You thought carnivore was about meat. It’s about fat. And every week spent eating trimmed meat, forcing the liver to handle a torrent of methionine without adequate lipid support, is a week you move your body away from the response it should have.

If you recognize yourself in this mechanism—this feeling of having made the purest dietary choice without gaining the physical clarity that should follow—the logical next step is not to find another expert who will prescribe synthetic folate. It’s to understand how your carnivore plate is truly composed, and whether it’s subjecting your liver to a protein load your current fat ratio cannot handle.

Is your homocysteine rising because you lack plants, or because your carnivore plate is leaner than your metabolism can support?

Analyze My Metabolic Terrain and Carnivore Composition

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