You may have heard that you should not eat cruciferous vegetables because they are goitrogenic foods. Kale and broccoli are two examples of cruciferous vegetables. Eating too many servings of cruciferous vegetables may interfere with thyroid hormone production.
It is advantageous to eat cruciferous vegetables, such as broccoli and kale, because of the health benefits that they provide. Having a few servings of cruciferous vegetables per week will not have a detrimental effect on thyroid hormone production.
If you are still worried about eating these foods, you can always cook them, which will lower the goitrogenic content of the foods.
Let’s talk about the health benefits of broccoli and kale and what makes them superfoods.
If you’re wondering what exactly is in these green powerhouses that makes them so “super,” I’ve dived into the research to give you some nerdy reasons to make these a staple in your diet.
Both vegetables are related to each other in the Brassica family. This family of super plants also includes cauliflower, cabbage, mustard greens, and Brussels sprouts.
These superfoods have a tone of nutrition, and other health-promoting compounds, they’re relatively inexpensive and easy to cook, too!S
Super nutrition
Broccoli and kale are full of nutrition: vitamins, minerals, fiber, etc. They’re both considered to be nutrient dense which is a measure of nutrients per calorie – and these both have a lot!
100 grams of broccoli (about 1 cup, chopped) contains:
- 34 calories
- 2.8 g protein, 0.4 g fat, 6.6 g carbohydrates, and 2.6 g fibre.
- Good source of B vitamins (when eaten raw)
- >100% of your daily vitamin C
- Almost 100% of your vitamin K
- Good source of manganese
- Traces of all the other vitamins and minerals
One cup of loosely packed kale contains:
- 8 calories
- 0.7 g protein, 0.2 g fat (including omega-3), 1.4 g carbohydrates, and 0.6 g fibre.
- Contains pre-vitamin A (beta-carotene).
- Several B vitamins, including B1, B3, B5, B6, and folate (B9)
- Rich in vitamins C and K
- Lots of minerals including manganese, magnesium, iron, potassium, sulfur, copper, phosphorus, and calcium
As you can see, these two foods contain a lot of nutrients.
NOTE: Too much vitamin K may interact with certain blood-thinning medications. If you’re taking one of these medications, talk to your doctor or pharmacist before incorporating too much of these superfoods into your diet.
Broccoli and kale also contain other health-promoting compounds.
Super health-promoting compounds
Broccoli and kale tend to taste a bit bitter – but that bitterness equals healthfulness!
This bitter flavor is from some of the health-promoting compounds in these super plant foods. Things like glucosinolates (e.g., sulforaphane and isothiocyanates) and polyphenol flavonols.
There are a few different types of kale – from curly kale, to dinosaur kale, to red/purple kale. The different colours result from slight differences in the amounts of the compounds these plants contain.
One of the main active ingredients in cruciferous vegetables are glucosinolates. These antioxidant compounds are very useful to help detoxify and protect against cancer.
FUN FACT: It’s the precursors to glucosinolates that are in cruciferous vegetables, not the compounds themselves. When fresh broccoli and kale are eaten (or even chopped/blended) raw the active compounds are produced. *This fact is incorporated into a trick I use in this week’s recipe*
NOTE: Glucosinolates may affect iodine absorption and thyroid health, particularly in people prone to thyroid disease. In this case, you may not have to ditch these superfoods altogether – just cook them first.
These superfoods also contain flavonols like kaempferol and quercetin. Flavonols have antioxidant and anti-inflammatory properties, and they decrease your risk of cancer.
Kale also contains carotenoids like lutein and zeaxanthin. Carotenoids are known for promoting eye health and are protective against many cancers.
When cooked, kale contains another anti-cancer compound called indole. C
Conclusion
Broccoli and kale are cruciferous superfoods. They are packed with nutrition and have a whole array of health-promoting compounds.
Almost everyone should be eating these regularly. Just be cautious if you’re taking blood-thinning medications; and, if you have thyroid issues, cook them first.
Do you, or anyone you know, absolutely love (or hate) these superfoods? Do you have a favourite recipe to share? Let me know in the comments below.
Recipe (Broccoli & Kale): Superfood Soup
Serves 4
2 tbsp extra virgin olive oil
1 tbsp garlic, chopped
2 large handfuls kale
4 stalks celery, chopped
4 stalks broccoli chopped
8 cups broth
½ cup tahini
2 tsp sea salt
Instructions
Sautee garlic in olive oil in a large soup pot. At the same time do steps #2 and #3.
Add half of the raw kale, celery, and broccoli to your high-speed blender (in that order). Cover with up to 4 cups of broth and blend.
Pour soup into the pot with the sauteed garlic. Do the same for the other half of the veggies and broth.
Heat soup and simmer for up to 5 minutes.
Remove from heat. Add tahini and sea salt. Stir well.
Serve & enjoy!
Tip: If you want the soup to be extra creamy, you can re-blend after it’s heated.
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