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Mustard greens nutrition facts

Spicy, pungent mustard greens or leafy mustard are indeed one of the most nutritious green leafy vegetables. These greens actually have more vitamin A, carotenes, vitamin K and flavonoid anti-oxidants than many commonly consumed fruits and vegetables.

This crispy leafy vegetable obtained from mustard plant belonging to brassica family which also includes cabbage, broccoli, brussels sprouts etc. Scientific name: Brassica juncea.

Mustard greens. Note for bright green broad leaves with serrated margins. (Photo : by nataliemaynor)	Mustard plant in a farm field. Note for bright yellow colored flowers. (Photo by: itchys )

The plant is native to sub Himalayan plains of Indian sub continent commonly cultivated for its leaves and oil seeds since ancient times. Several cultivars exist. Mustards are winter crops when the leaves are more flavorful from November till March. The plant reaches about 4-5 feet in height and bears golden yellow colored flowers. However its young tender leaves that is harvested when the plant reaches about 2 feet in height and used as green leafy vegetable.

Fresh mustards feature dark green colored broad leaves with flat surface and may have either toothed, frilled or lacy edges depending up on the cultivar type. Its light green stem branches out with many laterals.

Mustard seeds used as spice are being used for extensively in cooking as well as in oil production all over south Asian region.

Health benefits of mustard greens

• Mustard greens like spinach are the store house of many phytonutrients that have health promotional and disease prevention properties.

• Very low in calories (26 kcal per 100 g raw leaves) and fats, but rich in dietary fiber; recommended in cholesterol controlling and weight reduction programs. However, these greeny leaves contain very good amount of dietary fibre that helps control cholesterol level and also help protect against hemorrhoids, constipation as well as colon cancer diseases.

• Fresh mustard greens are an excellent source of several vital anti-oxidants and minerals like vitamin C, vitamin A, vitamin E, carotenes as well essential minerals such as calcium, iron, magnesium, potassium, zinc, selenium and manganese.

• The greens are supposed to be one of the highest among leafy vegetables which provide vitamin K. 100 g of fresh leaves contain about 497 mcg or about 500% of daily requirement of vitamin K 1 (phylloquinone). Vitamin K has found to have potential role in bone mass building function by promoting osteo-trophic activity in the bone. It also has established role in Alzheimer's disease patients by limiting neuronal damage in the brain.

• Fresh leaves are also very good source of folic acid. 100 g provide about 187 mcg (about 47% of RDA) of folic acid. This water soluble vitamin has an important role in DNA synthesis and when given before and early pregnancy help prevent neural tube defects in the baby.

• Mustard greens are rich source of anti-oxidants flavonoids, indoles, sulforaphane, carotenes, lutein and zeaxanthin. Indoles, mainly di-indolyl-methane (DIM) and sulforaphane have proven benefits against prostate, breast, colon and ovarian cancers by virtue of their cancer cell growth inhibition, cytotoxic effects on cancer cells.

• Fresh mustard leaves are excellent source of vitamin-C. Provides 70 mcg or about 117% of RDA per 100 g.  Vitamin-C (ascorbic acid) is a powerful natural anti-oxidant that offers protection against free radical injury and flu-like viral infections.

• The leaves are also an excellent source of vitamin-A (provide 10500 IU or 350% of RDA per 100 g).  Vitamin A is essential nutrient for maintaining healthy mucus membranes and skin and is also essential for vision.  Consumption of natural fruits rich in flavonoids helps to protect from lung and oral cavity cancers.

• Regular consumption of mustard greens in the diet is known to prevent arthritis, osteoporosis, iron deficiency anaemia and believed to protect from cardiovascular diseases, asthma and colon and prostate cancers.

Selection and storage

Mustards are winter crops. In the markets, look for fresh mustard greens featuring crispy, dark green leaves and should show vitality. Avoid sunken, spotted or discolored leaves.

The leaves wilt soon if kept at room temperature; therefore, should be stored in refrigerator immediately. Although they can be stored for up to 3 days in the cold storage, fresh mustard greens should be used as soon as early as possible to get maximum nutrition.

Preparation and serving methods

Mustard green soup, a Chinese delicacy. (Photo : by taste-buzz)

Fresh leaves, flower buds and stems are used in a variety of cuisines all over Asia and in Eastern Europe. 

Before cooking, wash the leaves thoroughly in clean running water to remove sand and soil and then rinsed in saline water for about 30 minutes in order to remove surface dust, any insecticide residues.  Trim away thick petioles and thick stems.

Here are some serving tips:

• Fresh tender mustard greens are eaten raw either as salad or as juice.

• Generally they are stew fried or steam cooked and mixed with other greens such as spinach, fenugreek etc in South Asian cuisines. Its pungent, peppery flavor is tamed by adding butter, tomato, garlic and onion to the recipes.

• The greens also mixes well with ham, pork and bacon.

Safety profile

• Like spinach, reheating of mustard green leftovers may cause conversion of nitrates to nitrites and nitrosamines by certain bacteria that thrive on prepared nitrate-rich foods. These poisonous compounds may be harmful to health.

• Phytates and dietary fiber present in the mustard greens may interfere with the bioavailability of iron, calcium and magnesium.

• Because of its high vitamin K content, patients taking anti-coagulants such as warfarin are encouraged to avoid this food since it increases the vitamin K concentration in the blood which is what the drugs are often attempting to lower. This effectively raises the effective dose of the drug.

• Mustards contain oxalic acid, a naturally occurring substance found in some vegetables which may crystallise as oxalate stones in the urinary tract in some people. It is therefore, people with known oxalate urinary tract stones are advised to avoid eating vegetables belong to brassica family.

• Mustard greens may also contain goitrogens which may interfere with thyroid hormone production and can cause thyroxin hormone deficiency in individuals with thyroid dysfunction.

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