推荐回答(2个)
“吃糖有害健康”的说法,近年在社会上流传甚广,吃糖会引起疾病,甚至吃糖减寿的舆论与日俱增。那么,“吃糖有害健康”的论点,源于何处呢?主要是一些医学家认为,多吃糖在体内可转化为脂肪,会导致发胖,甚至成为若干疾病的诱发因素。其实,人体所需的营养素颇多,任何一种食物或必需的营养素摄入过量,都会造成营养失调,引起不良后果,吃糖当然也不例外。长期大量吃糖,超出人体需要和肝脏处理能力,就可能对健康产生一定的危害。糖,吃多了不好,尤其是对中老年人。
但营养学家同时认为,从人体的生理需要出发,适量补充食糖,对健康是有益的,关键是科学地掌握“适量”这个“度”。营养学家认为,每人每天吃精制糖60克,即全年22公斤左右比较科学。而居住在高原地区的人及运动员等消耗能量大者,食糖量还可适当增加,但也不宜超过太多。至于老年人,则应适当减少吃糖量。
多吃糖是否有害健康这个的问题,在食糖消费量甚高的发达国家,也曾有过争论。为此,美国食品与药品管理局进行了为期三年的调查研究后指出:蔗糖除造成龋齿外,未发现对人体的危害。
并明确肯定四点
1、糖尿病、心脏病、高血压和癌症等疾病并非由食蔗糖引起。
2、蔗糖与胆结石症、儿童多动症无关。
3、蔗糖并不特别使人增肥,调查中发现有些肥胖者所吃的糖,并不比体重正常者多。
4、食蔗糖并不妨碍人体对外来必需营养成分的吸收。因此,糖被视为一种致命的饮食原料,是一种误解,说它是病患之源,也缺乏根据。
事实还证明,糖分摄取的减少,反而会造成多种危害。首先是摄取的能量中脂肪成分的比例会相应升高,增加了高脂血症、心脏病的发病概率。成年人饮食中,脂肪部分在总的能量摄取中应占比例在20%~25%之间。据1999年的调查,20岁~30岁的年轻人都超过了这个正常范围。其次是使大脑营养失调。为了维持大脑的正常运转,必须保证大量营养物质的摄取,而这部分营养的主要成分是葡萄糖,它广泛存在于平时摄取的糖分中。我们的饮食如果有意避开糖分,大脑就失去了支持其运转的葡萄糖的来源。
日常生活中常见一些人因担心发胖而远离甜食乃至限制主食的摄取,尤其是年轻人,一日三餐中主食的比例越来越低,由此误入了葡萄糖摄入不足的误区。对于热衷于减肥的人,应充分认识到糖分对大脑功能正常发挥的重要性,万不可顾此失彼。
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