December 20

What You Actually Need to Know About Kale


Medically review by Kim Langdon

benefits of kale

Learn the kale facts: different types of kale, nutritional benefits, and how to use this amazing cruciferous green vegetable with our handy reference guide.

Kale has become the darling vegetable of the nutrition world.

It is part of the Brassica group, which includes other cruciferous vegetables such as cabbages, cauliflower, Brussels sprouts, and broccoli.

Kale has gorgeous - sometimes very curly - leaves that have a unique earthy, and slightly bitter, flavor to them, with tough fibrous stems.

kale nutrition facts

Kale health benefits

When you see some of the stats on kale, it is very easy to see why it has become so popular!

Kale provides a nutrient-dense hit every time. 

It is packed with beneficial fiber, vitamin C, vitamin A, vitamin K and magnesium.

Kale is also a rich source of antioxidant polyphenols (at least 45 different polyphenols), ranking higher than other Brassica vegetables.

Polyphenols' different protective properties are known for their protection against the effects of aging and also oxidative stress.

Anti-aging and antioxidant?

  • Kale may contain up to 200% of your daily vitamin C requirements. This makes kale a powerful, natural antioxidant. Vitamin C is one of the main antioxidants that the body has and it is most concentrated in the adrenals. Vitamin C as an antioxidant also reduces the risk of atherosclerosis and other conditions related to oxidative damage.
  • Vitamin C reduces free radical damage caused by exposure to pollutants and helps to rejuvenate photo-damaged skin (excess sun exposure). It is an essential component in the production and maintenance of collagen and elastin, so it supports smooth skin.
  • It needs to be noted, however, that the levels of vitamin C and other nutrients in kale depend on the species, maturity, weather conditions and condition of the soil in which it is grown.
  • Kale and eye health

    Kale contains the carotenoids lutein and zeaxanthin, along with fantastic levels of beta-carotene which are all essential for good eye health and the prevention of eye conditions such as cataracts and macular degeneration.

    Kale and preventative health

    Kale, along with other cruciferous family members, contains glucosinolates which are then converted to compounds such as isothiocyanates, thiocyanates, and indoles.

    Regular consumption of kale and other cruciferous vegetables, to obtain adequate levels glucosinolates is associated with a reduced incidence of cancer.

    Be aware

  • These same cruciferous vegetables such as kale can also interfere with thyroid health due to the glucosinolate compounds in these foods. These foods are also known as goitrogens and can interfere with iodine metabolism. They do this by reducing iodine uptake and blocking the activity of thyroid peroxidase (TPO), which is needed for the conversion of T4 to active T3 in the thyroid. Care should be taken with people who may suffer from iodine deficiency or are suffering from any potential thyroid-related conditions.
  •  Kale also contains oxalates which can interfere with the absorption of calcium and may be implicated in the formation of kidney stones. If you are at risk of kidney stones, consult with your primary health care professional.
  • Kale is a good source of vitamin K – which needs to be monitored with people on blood-thinning medications such as warfarin. We would advise that if you are someone on these sorts of medication, seek out the advice of your primary health care professional before adding any new food rich in vitamin K to your diet.
  • Types of kale

    Types of Kale

    1. Curly kale – probably the most common type of kale that can be found in most supermarkets and green grocers.

    It has a pungent, almost peppery flavor that is very pleasant to the palate but if you prefer less bitterness, look for younger kale as leaves have a milder taste. 

    2. Lacinto kale – another popular type of kale also known as Tuscan kale or Tuscan cabbage (cavolo nero) or Dinosaur kale.

    It's leaves are narrow, dark green and wrinkly attached to a hard stem that should ideally be removed. It’s flavorsome and mildly astringent. 

    3. Redbor kale – this is a very pretty looking kale with ruffled leaves ranging from deep red to purple color, sometimes with some shades of green.

    As well as cooking, Redbor kale is also used for its ornamental qualities in the garden and for garnishes. 

    4. Russian (Siberian) kale – this type of kale is harder to find but is equally beneficial and delicious, with flat, fringed leaves that look like large rocket/arugula leaves and range from green to red/purple shades.

    It’s sweet and mild with traces of pepper and can be cooked in the same way as the other types of kale.

    What is the difference between green kale and red kale?

    The primary difference between the two is in the way they taste.  Red Russian kale is said to have a much sweeter and delicate flavor compared to green kale.

    Therefore, sometimes it's an easier option to get your taste buds introduced.

    Red kale nutrition is almost identical and both are great options for a nutrient-dense green leafy vegetable, packed with vitamin K, vitamin C and other antioxidants.

    Where to Buy Good Kale

    Fresh: From farmers' markets or supermarkets and - when possible - buy organic and local.

    Be on the lookout for nice dark, green-colored leaves and moist (not hard and woody) stems. Kale is also relatively easy to grow if you have a little patch of soil.

    Supplement form: You can get kale in a powdered capsule form, usually in combination with other dried greens.

    As always, we do not recommend you start any new supplement without consulting your primary health care professional first.

    How to use kale

  • Store kale in a plastic storage bag, removing as much air as possible. Keep unwashed kale in the refrigerator for about 5-7 days.
  • Kale can be eaten raw or lightly cooked as this helps to preserve the antioxidants, polyphenols and beta-carotene content.
  • It’s great in soups, stews, stir-fries, and salads.
  • You can make green smoothies, add it to a fresh salad raw or lightly sautéed with some butter, onion, and garlic.
  • Making kale chips by dehydrating the kale leaves is a great (and very moreish) way to eat kale. A dehydrator can be a great kitchen investment for getting in more fruits and veggies or preserving the harvest.
  • It is always usually best to remove the thick center stem, as this can be too tough to be enjoyable to eat.
  • To further enhance kale’s phytonutrient content, sprinkle the leaves with lemon juice before cooking and let sit for a few minutes.
  • Kale supplements

    Here at Happy Body Formula, we strongly believe in food as medicine and the power of real food.

    Because of this, we prefer to get the ‘good stuff’ in its whole form when possible.

    It is better to eat a wide range of seasonal vegetables and fruits to ensure you are getting a good range of nutrients.

    If you have trouble taking in greens, a good green powder supplement can help.

    We like Nested Naturals Super Greens powder. Overconsumption of one particular food can lead to nutrient excess, which can be just as detrimental to your health as nutrient deficiencies.

    What is your favorite way to use kale? We love this simple kale salad recipe. Share with us below!

    This article was fact checked for accuracy by Dr. Kim Langdon, MD. As always, this is not personal medical advice and we recommend that you talk with your doctor.



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    1. Thank you for an educational retreat in kale. After being diagnosed with heart failure, cardiomegally including cardiomyapathy my diet was transformed to stay alive. I’ve found kale to be one of the best food that cleanses and oxidize immediately. I was put on a low cal diet before the cardiac arrest. Abosolutely no fried foods, no meat, no cholesterol is mandatory to live. In this condition can you suggest something else that I can eat. The truth I am getting tired of kale. Thank you.

    2. Other leafy greens and non-starchy veggies will be great for you, so switch it up with some watercress and spinach, and add in some other crucifers like brussels sprouts, cabbage, broccoli and cauliflower.

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