Kale is a nutritional standout in three basic areas; antioxidant and anti-inflammatory nutrients, much-needed macronutrients, and cancer-preventive nutrients called glucosinolates. In addition to conventional antioxidants like vitamin C, beta-carotene, and manganese, kale also provides us with at least 45 different recently discovered flavonoids, including kaempferol and quercetin. Many of the flavonoids in kale are also now known to function not only as antioxidants, but also as anti-inflammatory compounds.
It provides us with a significant amount of alpha-linolenic acid (ALA), the basic building block for all omega-3 fats. Kale's special mix of cancer-preventing glucosinolates has been the hottest area of research on this cruciferous vegetable. Kale is an especially rich source of glucosinolates, and once kale is eaten and digested, these glucosinolates can be converted by the body into cancer preventive compounds. Some of this conversion process can also take place in the food itself, prior to consumption.
Also worth noting in kale's nutritional profile is its vitamin K content. Kale contains nearly twice the amount of vitamin K as most of its fellow cruciferous vegetables. In addition to the above-cited nutrients, according to our Food Rating System, kale is an excellent source of vitamin A (in the form of carotenoids), vitamin C, and manganese; a very good source of copper, tryptophan, calcium, vitamin B6, and potassium; and a good source of iron, magnesium, vitamin E, vitamin B2, protein, vitamin B1, folate, phosphorous, and vitamin B3.
This bag of kale varies in weight but is usually around 150g.