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Published on: 7/21/2026
Eating too much kale can have negative effects, largely due to its high oxalate content. Oxalates are natural compounds that may contribute to kidney stone formation, interfere with calcium and mineral absorption, and cause digestive discomfort in some people. Kale is also high in vitamin K, which can interact with blood-thinning medications, and its fiber content may lead to bloating or gas when consumed in large amounts. While kale is a nutrient-dense superfood, moderation is key to avoiding these potential drawbacks.
If you've been eating a lot of kale and are experiencing symptoms like abdominal pain, digestive issues, or unusual fatigue, it's worth understanding what might be going on. Take a free, instant, online symptom check to get personalized insights based on your specific symptoms and health profile. It only takes a few minutes, requires no sign-up, and can help you decide whether you should adjust your diet, monitor your symptoms, or consult a healthcare provider — giving you clarity and confidence in your next steps.
Reviewed for medical accuracy: 07/20/2026
Kale is a healthy vegetable, but eating too much of it can have some negative effects. This is because kale contains oxalates. Oxalates are natural compounds found in many foods, and they can affect your body, especially if consumed in large amounts.
Oxalates and Health: Foods high in oxalates, like kale, can contribute to the formation of kidney stones in some people. This is because oxalates can combine with calcium in the body to form crystals.
Iron Absorption: While oxalates are present in kale, they do not interfere with the absorption of non-heme iron, the type of iron found in plant foods. This means that eating kale won't prevent your body from getting the iron it needs from other plant sources.
Other Nutrients: Kale is also rich in nutrients like lutein and zeaxanthin, which are beneficial for eye health. These nutrients are important in reducing the risk of age-related eye issues.
In summary, while kale is nutritious, it's important to eat it in moderation to avoid potential negative effects from high oxalate levels. If you're experiencing any unusual symptoms after dietary changes, you can check your symptoms to better understand what might be happening with your health.
(References)
Noonan SC, & Savage GP. (1999). Oxalate content of foods and its effect on humans. Asia Pacific journal of clinical nutrition, 24393738.
Mrowicka M, Mrowicki J, Kucharska E, & Majsterek I. (2022). Lutein and Zeaxanthin and Their Roles in Age-Related .... Nutrients, 35215476.
genannt Bonsmann SS, Walczyk T, Renggli S, & Hurrell RF. (2008). Oxalic acid does not influence nonhaem iron absorption in .... European journal of clinical nutrition, 17440529.
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