Oxalates and Metabolic Health: How and Why Antinutrients From Plants Can Be Harmful

For The Metabolic Classroom lecture this week, Dr. Bikman explores the often-overlooked effects of oxalates on human health, with a focus on their impact on metabolic, kidney, cardiovascular, gut, and joint health.

Oxalates are natural compounds found in various plants, including leafy greens like spinach and kale, as well as certain nuts, seeds, grains, and legumes. They serve as a defense mechanism for plants against herbivores, as their high concentrations can cause irritation and reduce nutrient absorption. While often thought of as harmless, oxalates can act as “antinutrients” by binding to essential minerals such as calcium, magnesium, and iron, limiting their bioavailability and potentially leading to deficiencies.

Oxalates form crystals with calcium, creating a compound known as calcium oxalate. When these crystals accumulate in the body, they can contribute to kidney stones—a problem that affects many people. Ben explains that calcium oxalate crystals make up about 80% of all kidney stones, underscoring the connection between oxalate consumption and kidney health. Individuals prone to kidney stones, particularly those consuming high-oxalate diets or taking high doses of vitamin C (which the body can convert to oxalates), may face a heightened risk.

To mitigate oxalate-related health risks, Dr. Bikman suggests practical strategies, including reducing high-oxalate foods, ensuring adequate calcium intake to bind oxalates in the gut, staying hydrated to aid in oxalate excretion, and consuming fermented foods or probiotic supplements to support a healthy gut microbiome. He also highlights the importance of a balanced approach to vitamin C supplementation, as excessive intake may increase oxalate production in the body.

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Due to character length constraints, references are not posted here. However, for a complete list, we respond quickly. Please email: [email protected] with your request, and be sure to mention which Metabolic Classroom episode you are referring to, which in this case is “Episode 78 - Oxalates & Metabolic Health”.

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