I Stopped Eating Nuts and My Joint Pain Disappeared

For years, I had this recurring ache in the joints. Not debilitating. Not the kind of pain that sends you to a doctor. Just a dull, persistent soreness that I had quietly accepted as part of getting older. When I shifted to a low-carb, ketogenic way of eating, most of my body pain faded. The widespread aching I had carried for so long started to lift within weeks. But those thumb joints? They stayed sore.

I did not connect it to food at the time. I had already changed so much about the way I ate. I had cut out sugar, grains, processed seed oils, and most carbohydrates. I was eating well by any reasonable low-carb standard. And nuts were part of that picture. Almonds, walnuts, the occasional handful of cashews. They were allowed. They were convenient. They were, according to everything I had read, healthy.

Then I transitioned to a carnivore way of eating. Meat, fat, salt. Eggs. Some dairy. That was it. And within a few weeks, the ache in my thumb joints disappeared.

I did not go looking for an explanation right away. I just noticed the absence of something I had stopped expecting to lose. But eventually I started asking why. And what I found changed the way I think about nuts entirely.

Nuts Are High in Oxalates, and Oxalates Are Not Benign

Oxalates are compounds that plants produce naturally. They serve the plant as a defense mechanism, a way of making themselves less appealing or more toxic to the creatures that might eat them. When you consume high-oxalate foods, your body has to manage those compounds. For many people, it does so without obvious symptoms. But for others, particularly those who consume high-oxalate foods regularly, the picture is more complicated.

Oxalates are classified as antinutrients because they bind tightly to minerals, primarily calcium, magnesium, and iron, blocking their absorption. That alone is worth paying attention to. But the more pressing issue is what happens when oxalate levels accumulate systemically.

Oxalates can bind with calcium to form calcium oxalate crystals that deposit in joints, causing inflammation and pain, similar to the way they contribute to kidney stone formation. Those crystals are microscopic, but their sharp edges can collect in soft tissues and create pain in connective tissue and joints. For people who already have joint injuries or any degree of arthritis, a high-oxalate diet can worsen existing symptoms.

Almonds are one of the highest-oxalate foods you can eat. A standard serving contains more oxalate than a cup of spinach. Walnuts, cashews, and pecans also land high on the oxalate scale. If you were eating nuts daily on keto, as most people do, you were consuming a consistent and significant oxalate load every single day.

Meats, fats, and salt contain no oxalates. Dark chocolate, spinach, almonds, cashews, peanuts, and sweet potatoes do. When I removed the nuts and went fully animal-based, I removed my single largest daily source of oxalates without realizing it. My thumb joints did not care about my intentions. They just responded to the change.

The Oxalate Dumping Problem

Here is something most people do not know. When you reduce oxalate intake significantly, your body may begin releasing stored oxalate crystals from tissues where they have been deposited over time. This process is sometimes called oxalate dumping, and it can temporarily cause joint pain, skin issues, fatigue, or urinary symptoms as your body clears the backlog.

If you cut nuts and other high-oxalate foods and feel worse before you feel better, this is likely why. The body is not reacting badly to the removal of oxalates. It is finally getting the opportunity to clear them. The discomfort is a sign that something is moving, not that you have made a mistake.

I did not experience dramatic dumping symptoms myself, but I have spoken with enough people who have to know this is a real and common pattern. Slow reduction, rather than an abrupt overnight cut, tends to make the process more manageable.

Nuts Also Contain Other Plant Chemicals Worth Knowing About

Oxalates are not the only issue. Nuts carry a range of other compounds that fall under the broader category of antinutrients.

Phytic acid is present in significant amounts in most nuts. It binds to zinc, iron, calcium, and magnesium in the digestive tract and reduces how much of those minerals your body actually absorbs. You might be eating a nutrient-dense diet on paper and still coming up short on key minerals because of phytic acid interference.

Lectins are another category. These are proteins that plants use as a defense, and they can irritate the gut lining in susceptible people, contributing to intestinal permeability and systemic inflammation. Most nuts contain lectins to varying degrees.

Tannins, present in walnuts and pecans in particular, are polyphenols that also bind to minerals and proteins, further reducing absorption. They are often presented as antioxidants, which they are, but antioxidant activity and overall health impact are not the same thing. A compound can protect a plant cell and still cause problems in a human digestive system.

None of this means that every person who eats nuts will experience obvious symptoms. But if you are dealing with unexplained joint pain, skin issues, digestive complaints, or fatigue that does not have a clear cause, the cumulative chemical load in your daily nut consumption is worth examining.

The Mold Question

This one surprised me when I started looking into it, and I think it deserves more attention than it gets in mainstream nutrition conversations.

Nuts are highly susceptible to mold contamination, specifically a type of mold that produces compounds called aflatoxins. Aflatoxins are secondary metabolites produced by species of Aspergillus mold. The chief crops affected include corn, peanuts, cottonseed, and tree nuts. Almonds, pistachios, and walnuts are among the major food commodities affected.

Nuts are highly exposed to fungal contamination in the field, during transport, and during storage, and this exposure can result in the production of mycotoxins. Aflatoxins are among the most concerning mycotoxins because they are potent liver toxins and known carcinogens.

Here is what makes this harder to dismiss than you might expect. Aflatoxin levels rose above safe limits in all experimental nuts stored for three or six months at room temperature. Think about how nuts are sold and stored. They sit in warehouse facilities, travel in shipping containers, wait on store shelves, and then sit in your pantry. The cumulative timeline from harvest to your handful is often many months.

Natural contamination of nuts with aflatoxin is unavoidable and presents a persistent challenge for nut safety and quality. Roasting reduces but does not eliminate aflatoxin content. And the contamination is not evenly distributed. In nuts, the toxins tend to be confined to a relatively few units, meaning a single contaminated nut in a bag can carry extremely high levels of the toxin.

Peanuts deserve special mention here. They are not technically tree nuts. They grow underground, which puts them in direct and prolonged contact with soil fungi. They are among the most aflatoxin-contaminated foods in the global food supply. Peanut butter, peanut flour, and roasted peanuts sold in bulk are particularly vulnerable because the contamination is not visible, does not affect taste, and survives roasting. If you have been snacking on peanuts as a keto-friendly protein source, this is worth knowing.

This does not mean you will get sick from eating a handful of almonds. Regulatory systems exist to monitor contamination and pull products that exceed action levels. But it does mean that the daily nut habit many keto eaters have built carries a background fungal exposure that most people never think about. And for people with immune sensitivity, liver burden, or inflammatory conditions, that ongoing low-level exposure may matter more than the regulatory averages suggest.

What Keto Gets Right, and Where Nuts Fit In

I want to be clear about something. A ketogenic diet is a genuinely powerful tool for metabolic health. Cutting sugar, eliminating processed carbohydrates, and shifting the body toward fat burning are all meaningful steps. For most people coming from a standard diet, going keto produces real and significant improvements.

Nuts fill a practical role in keto eating. They are portable and satisfying, and when you are trying to stay under twenty grams of carbohydrates a day and avoid hunger, a bag of almonds is an easy answer. I understand why they became a staple for me and for so many others. But practical does not mean unlimited, and nuts are one of those foods where the carbs sneak up faster than people expect. We count total carbs, not net carbs. Fiber does not get a free pass in my book, and subtracting it gives you a false sense of how much carbohydrate you are actually consuming. A small handful of cashews or almonds can quietly push you past your daily threshold before you have eaten a real meal.

Nuts are not the worst food you can eat. But they are far less neutral than the keto community tends to treat them. Less often than you think is the right frequency.

You Do Not Have to Go Carnivore to Benefit from This

Removing nuts from a keto diet, or any diet, is a reasonable experiment if you have joint pain, skin problems, mineral deficiencies, or digestive symptoms that have not fully resolved despite eating well by other measures.

You do not need to commit to an all-animal diet to see whether nuts are a problem for you. Remove them for four to six weeks. Pay attention to what changes. That is the clearest signal you will get, and it costs you nothing but the almonds.

For me, the answer was unambiguous. The joint pain I had quietly accepted as inevitable turned out to be optional. I was just eating the wrong plants.

FAQ

Are nuts allowed on a ketogenic diet?
Yes. Most nuts are low in net carbohydrates and fit within keto macros. But fitting the macros does not mean nuts are without downsides. They are high in oxalates and other antinutrients that can cause problems for some people even within a well-structured keto diet. Total carb counts also add up faster than most people expect.

Can nuts cause joint pain?
For some people, yes. Nuts are among the highest-oxalate foods in a typical diet. Oxalates can form calcium oxalate crystals that deposit in joints and trigger inflammation. If you have unexplained joint pain that has not resolved with dietary improvements, nut consumption is worth examining.

What are aflatoxins and why do they matter?
Aflatoxins are toxic compounds produced by Aspergillus mold, which commonly contaminates tree nuts including almonds, walnuts, cashews, and pistachios, as well as peanuts. Contamination can occur in the field, during transport, or in storage, and levels can rise above safe limits over time. They are not visible or detectable by taste.

Are peanuts worse than tree nuts for mold?
Peanuts grow underground in direct contact with soil fungi, making them particularly susceptible to aflatoxin contamination. Peanut butter and bulk roasted peanuts are among the most consistently contaminated forms. Roasting does not eliminate the toxin.

What are oxalates and which nuts are highest in them?
Oxalates are antinutrients produced by plants. They bind to minerals and can form crystals in body tissues. Almonds, cashews, and peanuts are among the highest-oxalate nuts. Walnuts and pecans are also relatively high.

What is oxalate dumping?
Oxalate dumping refers to the temporary release of stored oxalate crystals from body tissues when dietary oxalate intake drops significantly. It can cause transient joint pain, skin reactions, or urinary symptoms. Reducing oxalates gradually rather than all at once tends to make this transition more comfortable.

References

Campbell BC, Molyneux RJ, Schatzki TF. Current research on reducing pre- and post-harvest aflatoxin contamination of U.S. almond, pistachio, and walnut. Journal of Toxicology: Toxin Reviews. 2003;22(2-3):225-266.

Abdel-Wahhab MA, et al. Effects of storage periods and temperature on mold prevalence and aflatoxin contamination in nuts. Pakistan Journal of Nutrition. 2018;17(5):219-227.

MDPI Processes. Fungal isolation, detection, and quantification of aflatoxins in nuts sold in the Lebanese market. 2024;12(5):1018.

Taghizadeh SF, et al. Aflatoxin in raw and salt-roasted nuts sold in markets of Tabriz, Iran. Iranian Journal of Public Health. 2014. PMC4138677.

Norton SK. Painful gout, joint pain, and oxalates. SallyKNorton.com. 2023.

MosaicDX. Do green smoothies and berries cause high oxalates and joint pain? 2025.

This article is for informational and educational purposes only. It does not constitute medical advice and is not intended to diagnose, treat, cure, or prevent any condition. Please consult a qualified healthcare provider before making changes to your diet, particularly if you are managing a health condition.