1、視黃醇參與視覺形成中的循環(huán)過程視黃醇參與視覺形成中的循環(huán)過程 干眼病維生素a缺乏最明顯的癥狀。結膜、角膜上皮組織變性，淚腺受損分泌減少，結膜出現(xiàn)皺紋，失去正常光澤。患者常感眼睛干燥、怕光、流淚，發(fā)炎，疼痛畢脫氏斑畢脫氏斑 （ bitot spots ）膳食計算:視黃醇當量視黃醇當量(g)*=1/3vit a (iu)+1/6-胡蘿卜素胡蘿卜素(g)rni 800 g 視黃醇當量視黃醇當量ul 3000 g 視黃醇當量視黃醇當量 維生素維生素a 497243814060575040vit d缺乏癥“o”型腿硫胺素（硫胺素（thiaminethiamine）1 1、特性與生理功能：、特性與生理功能

2、：嬰兒腳氣病嬰兒腳氣病pork is the richest source of thiamin, but enriched or whole-grain products typically make the greatest contribution to a days intake because of the quantities eaten. sunflower seeds and legumes such as split peas are also valuable sources of thiamin.兒童生長遲緩口腔粘膜潰瘍、地圖舌all of these foods are

3、 rich in riboflavin, but milk and milk products provide much of the riboflavin in the diets of most people.the reactive sites that accept and donate hydrogens are highlighted in white. leafy green vegetables (such as spinach and broccoli), legumes (such as black beans, kidney beans, and black-eyed p

4、eas), liver, and some fruits (notably oranges) are naturally rich in folate.most protein-rich foods such as meat, fish, and poultry provide ample vitamin b6; some vegetables and fruits are good sources, too.皮炎（dermatitis）舌炎protein-rich foods such as meat, fish, poultry, and peanut butter contribute much of the niacin in peoples diets. enriched breads and cereals and a few vegetables are also rich in niacinthe discoverer of scurvywhen dietitians say “vitamin c,”