膳食(shi)纖(xian)維是指(zhi)不(bu)能被人體消化道酵素(su)分(fen)解的(de)多糖類(lei)及木植素(su).

      在(zai)消化(hua)系統中(zhong)有(you)吸收水份的(de)作(zuo)用;增加(jia)腸(chang)道(dao)及胃(wei)(wei)內的(de)食(shi)物(wu)體積,可增加(jia)飽(bao)足感;又能促進腸(chang)胃(wei)(wei)蠕動,可舒解便(bian)(bian)秘;同時膳食(shi)纖維也能吸附腸(chang)道(dao)中(zhong)的(de)有(you)害物(wu)質(zhi)以便(bian)(bian)排出;改善腸(chang)道(dao)菌群,為益生菌的(de)增殖(zhi)提(ti)供(gong)能量(liang)和(he)營養.

       膳食纖(xian)維是非淀粉多糖(tang)的多種植(zhi)物(wu)物(wu)質,主(zhu)要來自于動(dong)植(zhi)物(wu)的細胞壁,包括(kuo)纖(xian)維素、木質素、蠟、甲殼質、果膠、β葡聚糖(tang)、菊糖(tang)和低聚糖(tang)等,通常分為(wei)非水溶(rong)性膳食纖(xian)維及水溶(rong)性膳食纖(xian)維兩(liang)大類.

       膳食(shi)纖(xian)維(wei)是健康(kang)飲食(shi)不(bu)可(ke)缺(que)少的,纖(xian)維(wei)在(zai)保持消(xiao)(xiao)化(hua)系統健康(kang)上扮演著重(zhong)要的角色(se),同(tong)時攝(she)取(qu)足夠的纖(xian)維(wei)也(ye)可(ke)以(yi)預(yu)防(fang)心血管疾病、癌(ai)癥、糖尿病以(yi)及(ji)其它疾病.纖(xian)維(wei)可(ke)以(yi)清潔(jie)消(xiao)(xiao)化(hua)壁和(he)增強消(xiao)(xiao)化(hua)功能,纖(xian)維(wei)同(tong)時可(ke)稀(xi)釋和(he)加(jia)速(su)(su)食(shi)物中(zhong)的致癌(ai)物質和(he)有毒物質的移除,保護脆(cui)弱的消(xiao)(xiao)化(hua)道(dao)和(he)預(yu)防(fang)結腸(chang)癌(ai).纖(xian)維(wei)可(ke)減緩消(xiao)(xiao)化(hua)速(su)(su)度和(he)最快速(su)(su)排泄膽固醇,所以(yi)可(ke)讓血液中(zhong)的血糖和(he)膽固醇控制在(zai)最理想(xiang)的水(shui)平.