These tiny crystals destroy your mitochondria, brain and gut

Why oxalates can become a problem in an already overloaded system

If you’ve looked into oxalates at all, you’ve probably ended up on some version of the same advice: cut out spinach, almonds, sweet potato, and beets. However, dietary oxalate is not the main problem for most people who react badly to oxalates. The body generates substantial amounts of oxalate endogenously from glucose metabolism, amino acid metabolism, vitamin C breakdown, lipid peroxidation from excess PUFA, collagen turnover, and microbial pathways. This means you can remove every high oxalate food from your diet and still be overloaded with oxalate because your body is making it faster than you can eliminate it.

The symptoms are confusing, because oxalate doesn’t stay in one place. Calcium oxalate crystals can irritate any tissue they come in contact with because they’re so sharp. I’ve seen oxalate involvement in clients presenting with kidney stones, peripheral neuropathy, burning feet, random joint pain, muscle knots that feel crystalline, fibromyalgia type tenderness, chronic fatigue with no clear cause, sudden energy crashes, histamine flares, migraines, dizziness, palpitations, poor heat tolerance, and food reactions that seem completely random. The same person might have three or four of these at once with no obvious thread connecting them until you trace it upstream.

calcium oxalate crystals. these shred and poke your tissues.

What makes oxalate so disruptive is what it does to mitochondria. Oxalate slows the krebs cycle by almost 50%. It inhibits pyruvate carboxylase and pyruvate kinase, raises NADH and lowers NAD+, impairs ATP generation and depletes glutathione. It pushes glycolysis to misfire and generate toxic intermediates like methylglyoxal. When calcium oxalate crystals form, they activate inflammatory pathways which create small but chronic waves of inflammation that never fully resolve.

This is why oxalate symptoms show up everywhere. They’re not really oxalate symptoms, they’re more-so mitochondrial symptoms driven by an oxalate burden the body can’t clear.

The practical implication is that removing high oxalate foods is a downstream intervention. It’s sometimes useful, but it’s not the main work because nothing is really being resolved. You need to restore the metabolic environment that determines whether glyoxylate (the precursor) gets converted to glycine and CO2, or whether it gets pushed into oxalate production.

In this deep dive, I’m going to walk through what I assess when I suspect oxalate is a driver, including the OAT pattern reads that tell you whether the oxalate is coming from diet, endogenous synthesis, or fungal overgrowth. I’ll cover the bloodwork patterns, including why low AST and low ALT on a standard panel are often functional B6 depletion from chronic oxalate handling, and why oxalate can cause a functional iron blockade that looks like anemia but won’t respond to iron supplementation.

Then I’ll walk through the phased protocol I use with clients, starting with mitochondrial and redox support rather than diet modification, correcting the specific B vitamins that drive endogenous oxalate generation, the role of calcium and magnesium pairing with meals, carbohydrate management, gut repair (including the critical piece most practitioners miss about antibiotic history and oxalobacter formigenes), and how to manage the dumping phase without destabilising.