Kale isn’t just a trendy green—it’s a nutritional powerhouse. Packed with antioxidants, vitamins, minerals, and compounds that may protect against chronic disease, kale deserves a spot in your diet.
Whether eaten raw, sautéed, baked, or blended into smoothies, this versatile leafy green offers serious health perks. Here’s a look at 9 science-backed benefits of kale.
1️⃣ Highly Nutritious
Kale is a cruciferous vegetable, related to cabbage, broccoli, and Brussels sprouts. There are many varieties, with curly kale (Scots kale) being the most popular.
Nutritional content per 1 cup (21g) of raw kale:
- Calories: 7–8
- Carbs: 1g
- Fiber: 1g
- Vitamin K: 68% DV
- Vitamin C: 22% DV
- Manganese: 8% DV
- Vitamin A: 6% DV
- Riboflavin: 5% DV
- Calcium: 4% DV
Kale also contains small amounts of folate, B6, potassium, magnesium, and iron, making it a low-calorie, nutrient-dense superfood.
2️⃣ Packed with Antioxidants
Like other leafy greens, kale is very high in antioxidants.
These include beta-carotene and vitamin C, as well as various flavonoids and polyphenols.
Antioxidants are substances that help counteract oxidative damageTrusted Source by neutralizing free radicals in the body.
Oxidative damage is believed to be among the leading drivers of aging and many chronic conditions, including cancer.
But many substances that happen to be antioxidants also have other important functions.
This includes the flavonoids quercetin and kaempferol, which are found in relatively large amounts in kale.
Test-tube and animal studies suggest that these compounds may help ease inflammation, support heart health, slow the growth of cancer cells, and protect against chronic disease.
Kale is loaded with antioxidants, including:
- Beta-carotene
- Vitamin C
- Flavonoids (quercetin, kaempferol)
- Polyphenols
These compounds neutralize free radicals, which may help slow aging, reduce inflammation, and protect against chronic diseases like cancer and heart disease.
3️⃣ Excellent Source of Vitamin C
Vitamin C is an important water-soluble antioxidant that serves many vital functions in the body’s cells. For example, it is necessary for the synthesis of collagen, the most abundant structural protein in the body.
And kale is higher in vitamin C than most other greens. It contains about three times as much vitamin C as spinach and collard greens.
This makes kale an excellent addition to a healthy, well-rounded diet, alongside other fruits and vegetables rich in vitamin C.
Kale contains three times more vitamin C than spinach or collard greens, supporting:
- Collagen production
- Immune function
- Antioxidant protection
Adding kale to your meals is a great way to meet your daily vitamin C needs.
4️⃣ May Lower Cholesterol
Cholesterol has many important functions in the body. For instance, it is used to make bile acids, which are substances that help the body digest fats.
The liver turns cholesterol into bile acids, which are then released into the digestive system whenever you eat a high fat meal. When all the fat has been absorbed and the bile acids have served their purpose, they are reabsorbed into the bloodstream and used again.
Certain substances in kale can bind bile acidsTrusted Source in the digestive system and prevent them from being reabsorbed. This reduces the total amount of cholesterol in the body.
One 2016 study in 149 people with metabolic syndrome found that consuming 14 g of kale powder every day for 8 weeks significantly reduced levels of LDL (bad) cholesterol, along with blood pressure, belly fat, and fasting blood sugar levels.
Certain compounds in kale can bind bile acids, preventing them from being reabsorbed. This helps lower total cholesterol and LDL (bad) cholesterol.
A 2016 study found that 14g of kale powder daily for 8 weeks reduced LDL, blood pressure, belly fat, and fasting blood sugar in people with metabolic syndrome.
5️⃣ Excellent Source of Vitamin K
Vitamin K is an important nutrient.
It is absolutely critical for blood clotting, and it does this by “activating” certain proteins and giving them the ability to bind calciumTrusted Source.
The well-known anticoagulant drug Warfarin actually works by blocking the functionTrusted Source of this vitamin.
Kale is an excellent source of vitamin K, with a single raw cup containing almost 70%Trusted Source of the recommended daily amount.
The form of vitamin K in kale is K1, which is different than vitamin K2. Vitamin K2 is found in fermented soy foods and certain animal products and may help preventTrusted Source heart disease and osteoporosis.
Vitamin K is crucial for blood clotting and bone health.
- 1 cup raw kale = ~70% DV of vitamin K1
- Supports protein activation that binds calcium
- May help maintain bone strength
Note: Vitamin K2, found in fermented foods, may further support heart and bone health.
6️⃣ Contains Anticancer Compounds
Cancer is a condition characterized by the uncontrolled growth of cells.
Kale is actually loaded with compounds that are believed to have protective effects against cancer.
One of these is sulforaphane, a substance that has been shown to help block the formation of cancer at the molecular level.
It also contains a indole-3-carbinol, another substance that is believed to help preventTrusted Source cancer.
Kale contains compounds that may help prevent cancer, including:
- Sulforaphane: Blocks cancer formation at the molecular level
- Indole-3-carbinol: Supports detoxification and may prevent cancer
7️⃣ High in Beta-Carotene
Kale is often claimed to be high in vitamin A, but this is not entirely accurate.
It is actually high in beta-carotene, an antioxidant that the body can convert into vitamin A.
Adding kale to your diet, alongside a variety of other foods rich in vitamin A, can help you meet your needs for this essential vitamin.
Kale is rich in beta-carotene, which the body converts into vitamin A, essential for:
- Vision
- Immune function
- Healthy skin
8️⃣ May Support Eye Health
Though your vision tends to worsen as you get older, there are certain nutrients that may help support healthy vision over time.
Two of the main ones are lutein and zeaxanthin, carotenoid antioxidants that are found in large amounts in kale and some other foods.
Kale contains lutein and zeaxanthin, carotenoids linked to:
- Reducing age-related macular degeneration
- Protecting against cataracts
- Supporting overall eye health
9️⃣ Could Help with Weight Management
Kale has several properties that can support weight management.
For starters, it is very low in calories but still provides significant bulk that should help you feel full.
Because of the low calorie and high water content, kale has a low energy density. Eating plenty of foods with a low energy density has been shown to aid in weight loss.
Kale also contains a small amount of fiber, which is an important nutrient that has been linked to weight lossTrusted Source.
Although there are no studies directly testing the effects of kale on weight loss, it makes sense that it could be a useful addition to an eating pattern aimed at weight loss.
Kale is low in calories but high in bulk, helping you feel full while keeping calorie intake low. Its fiber content supports satiety and digestion, making it a great addition to a weight-conscious diet.
How to Add Kale to Your Diet
- Toss raw kale into salads
- Make kale chips with olive or avocado oil, baked until crisp
- Blend into smoothies for an antioxidant boost
- Sauté or steam as a side with garlic and lemon
Kale’s nutty, earthy flavor pairs well with a wide range of dishes, from soups and stir-fries to grain bowls and wraps.
Bottom Line
Kale is a super nutritious leafy green loaded with antioxidants, vitamins C and K, beta-carotene, and compounds that may support heart health, eye health, weight management, and cancer prevention.
Including kale in your diet is simple, tasty, and a powerful way to boost your overall health.
