Facts about Spinach

1. 07

   Nitrate content in spinach leaves can reach 2,500 milligrams per kilogram of fresh weight, making it one of the highest nitrate-accumulating vegetables and a significant dietary source of this compound that converts to nitric oxide in the body.

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2. 06

   Spinach contains lutein and zeaxanthin, two carotenoids that accumulate in the retina and reduce age-related macular degeneration risk by approximately 26 percent according to clinical studies.

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3. 05

   Three cups of cooked spinach provides approximately 6.4 milligrams of iron, making it one of the most iron-dense vegetables available by weight.

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4. 04

   Popeye the Sailor Man's 1929 debut popularized spinach consumption in America, though the character was originally depicted eating other vegetables before spinach became his signature food.

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5. 03

   Oxalic acid in spinach binds calcium and iron, reducing their bioavailability by approximately 5-15 percent compared to other leafy greens like kale.

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6. 02

   In 1870, German chemist Erich von Wolf accidentally discovered spinach's iron content through chemical analysis, though the famous decimal point error myth about 10x overcounting iron emerged decades later in the 1970s.

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7. 01

   A single cup of raw spinach contains approximately 141 micrograms of vitamin K, exceeding the daily recommended intake of 120 micrograms for adult men.

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