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Wonderfully nutritious collard leaves are very low in calories (provide only 32 calories per 100 g) and contain no cholesterol. However, its green leaves contain a good amount of soluble and insoluble dietary fiber that helps control LDL cholesterol levels and offer protection against hemorrhoids, constipation as well as colon cancer diseases.
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Widely considered to be a wholesome food; collards are rich sources of phytonutrients with potent anti-cancer properties, such as Di-indolyl-methane (DIM) and sulforaphane that have proven benefits against prostate, breast, cervical, colon, ovarian cancers by virtue of their cancer-cell growth inhibition and cytotoxic effects on cancer cells.
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Di-indolyl-methane has also found to be effective immune modulator, antibacterial and anti-viral properties by potentiating Interferon-gamma receptors.
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The leaves are also excellent sources of folates, provides about 129 µg or 32% of RDA. Folates play a major role in the DNA synthesis, and when given during the peri-conception period can prevent neural tube defects in the baby.
for more info:
https://www.nutrition-and-you.com/collard-greens.html
http://www.whfoods.com/genpage.php?tname=foodspice&dbid=138