You've probably heard time and again that kale is the undisputed king of the superfood world. This leafy green is literally overflowing with beneficial nutrients: calcium, iron, magnesium, potassium, fiber, and vitamins A, C, and K.
Furthermore, the kale superfood is an exceptionally rich source of carotenoids — natural plant compounds that act as powerful antioxidants and are vital for eye health, skin elasticity, and a strong immune system. However, absorbing all these kale health benefits is not as simple as it seems at first glance.
New scientific evidence suggests that exactly how to prepare kale and consume it is the deciding factor in whether your body will actually absorb its nutrients or if they will simply pass right through your system.
🔑 Fat as the key to unlocking fat-soluble vitamins
During the experiment, researchers simulated the complete process of food passing through the human mouth, stomach, and small intestine to test the leafy green's bioavailability.
"Kale contains a colossal amount of fat-soluble vitamins and nutrients. The problem is that they are practically incapable of dissolving in the watery environment of our gastrointestinal tract if the cabbage is consumed alone. Because of this, their nutrient absorption is severely limited," explains study co-author Ruojie Vanessa Zhang, an assistant professor of food science at the University of Missouri.
Conversely, when we add olive oil to our salad, microscopic particles called mixed micelles form in the intestine during digestion. They pick up carotenoids and other fat-soluble vitamins, easily transport them through the gastric juices, and help them seamlessly penetrate the intestinal lining directly into the bloodstream.
🥗 The "jailbreak" effect: How to prepare kale correctly
To squeeze 100% of the health benefits out of this leafy green, experts recommend using a few simple culinary tricks:
- Massaging kale: Before adding raw kale to a salad, drizzle it with olive oil and thoroughly knead it with your hands for a minute. Food science professor David McClements explains that massaging kale mechanically breaks down the plant's rigid cell walls. Scientists call this the "jailbreak" effect for the vitamins locked inside.
- Cooking with oil: If you are wondering how to cook kale because you dislike it raw, you can steam, boil, sauté, or bake it into healthy kale chips. The main requirement is the presence of small fat droplets during or immediately after cooking.
- Alternative fat sources: Olive oil is ideal, but not the only option. You can use high-quality flaxseed or canola oil. Moreover, pairing kale with other healthy fatty foods like ripe avocado, pine nuts, cashews, or sunflower seeds will produce the exact same effect.
💡 Expert dietitian tips: How to destem kale easily
Kale is an incredibly powerful vegetable, and culinary experts advise experimenting with it boldly. However, many beginners give up on it because it can be overly tough and fibrous.
New York-based dietitian Keith Ayoob shares a professional secret on how to process the greens: never eat the central stem, as it is far too fibrous and poorly digested. To quickly separate the tender leafy part from the tough stalk, simply pinch the base of the stem firmly with your fingers, fold the leaves along it, and in one confident upward motion, strip the soft leaves away.
Remember: healthy eating is not about strict limitations or chewing on dry, flavorless salads. It is about understanding the biochemistry of our bodies. By adding just one spoonful of the right fat to your greens, you transform an ordinary dinner into a true elixir of youth and health.
Source: This material is prepared based on a study published on the National Geographic website.
