Ceylon Spinach is rich in antioxidants, particularly beta carotene and lutein - naturally occurring chemicals that help keep your cells from aging. The purple variety seems to be slightly higher in antioxidants, most likely anthocyanins due to the colour.
What nutrient-rich food to grow in urban context..
Eaten in India as "Gongura", the edible leaves of the "Whitten" strand have up to 34% Protein. The seeds can be ground into a gluten free flour for baking. It is a fast growing plant (faster than weeds), requires little water and can sequester 8x more carbon than evergreen trees