Bok choy of the Daily Value, DV) of vitamin A (30% DV), vitamin C (54% DV) and vitamin K (44% DV), while providing folate, vitamin B6 and calcium in moderate amounts (10–17% DV) (table). Chinese cabbage was ranked #2 for nutrient density out of 41 nutrient-rich plant foods. Bok choy contains glucosinolates. These compounds have been reported to prevent cancer in small doses, but, like many substances, can be toxic to humans in large doses, particularly to people who are already seriously ill. In 2009, an elderly diabetic woman who had been consuming 1 to 1.5 kg of raw bok choy per
Choy Li Fut district and called it Siu Buk Hung Sing Choy Li Fut. Eventually it was shortened to Buk Sing Choy Li Fut. Tam Sam's students referred to themselves as the Buk Sing branch of Choy Li Fut. A Northern Shaolin master named Ku Yu Jeung (aka Gu Ruzhang) befriended and joined Tam Sam and thus added more techniques to the Buk Sing Choy Li Fut curriculum. What makes Buk Sing Choy Li Fut a unique branch is that it concentrates on the application of Choy Li Fut techniques rather than the practice of forms. Because the emphasis is on combat applications,