Why You Should Stop Eating Kale Raw and Start Cooking it Instead

Kale has earned its reputation as one of the most nutrient-dense vegetables you can eat. A single serving delivers vitamins A, C, and K, minerals like calcium and potassium, and a range of phytonutrients that support health from your skin to your heart. But there’s a twist many people overlook: cooking kale can actually make it more nutritious and easier to digest than eating it raw.

One reason is oxalates. Like spinach, kale contains natural compounds called oxalates, which bind minerals such as calcium, iron, and magnesium, making them harder for the body to absorb. Light steaming or sautéing significantly reduces the oxalate content, freeing up those minerals and improving their bioavailability. That means your body gets more calcium for bones and more iron for red blood cells from the same bunch of kale once it has been cooked.

Cooking kale also helps soften its tough cell walls. The fibrous texture that makes raw kale leaves sturdy and sometimes bitter is due to cellulose and other structural components. Heat breaks these down, making the leaves tender, sweeter, and easier to chew. This not only improves flavor and texture but also makes certain nutrients, such as carotenoids (precursors to vitamin A), more accessible. When kale is sautéed with a little olive oil, fat-soluble nutrients like beta-carotene and vitamin K are released and absorbed more efficiently.

There is another layer to the story. Kale belongs to the cruciferous family, which also includes broccoli and cabbage. These vegetables contain glucosinolates, sulfur-containing compounds linked to cancer protection and detoxification pathways in the body. Cooking changes the profile of these compounds. While very high heat for long periods can reduce some benefits, light steaming or quick stir-frying can make glucosinolates more available without wiping them out. Gentle cooking strikes the right balance between preserving antioxidants and improving mineral absorption.

Some people find that raw kale causes bloating or digestive discomfort. This is because cruciferous vegetables contain raffinose and other complex sugars that can be difficult to break down. Heat partially pre-digests these compounds, making kale easier on the stomach. For those with sensitive digestion, cooking kale can be the difference between enjoying its nutritional benefits and avoiding it altogether.

The bottom line is that raw kale has its place — blended into a smoothie or massaged into a salad — but cooking it unlocks a different level of nutrition. Steaming, sautéing, or lightly roasting makes minerals more available, enhances antioxidant absorption, and improves digestibility, all while deepening flavor. If you want to get the most out of kale, do not be afraid to add a little heat. Your body will thank you for it.