对饮食加以限制的原因可能是宗教的,也可能是医学上的,如医生可能因病人脂肪和胆醇固高而劝其减轻体重或限制肉类摄入。 Burkitt声称植物纤维可阻止非洲工人的缺血性心脏病、结肠直肠息肉或肿瘤及其它疾病的进展。Anderson观察到素食者及其他高纤维膳食者血压平均值低于进食纤维较少者。多糖类纤维可吸收收水分、增加粪便量、缩短肠道道过时间、降低管腔内压。木质素和果 The reasons for restricting the diet may be religious or medical. For example, doctors may persuade them to lose weight or limit their intake of meat because of their high levels of fat and cholesterol. Burkitt claims that plant fiber can stop the progress of ischemic heart disease, colorectal polyps or tumors and other diseases among African workers. Anderson observed that average blood pressure was lower in vegetarians and other high-fiber diets than in those who consumed less fiber. Polysaccharide fiber can absorb moisture, increase the amount of stool, shorten the intestinal tract over time, reduce lumen pressure. Lignin and fruit