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Main components of humans alimentary canal are enzymes,water,mineral,grume and so on,acting different roles.As for enzymes,there are ptyalin,pepsin,pancreatic amylase,peptidase,sucrase,maltase etc.Basing on specificity and site-specific of enzymes to the substrate,food naturally contains some indigestible matters,because enzymes degrading these matters are absent.It was always said that the more digestible matters there were,the better food was.However,the problem of famine doesnt exist while "the Sickness of Modem Civilization" such as diabetes,hypertension,hyperlipemia troubles people very much with the increasing economic developments nowadays.