* “饭前喝汤,胜似药方”吃水果也是如此
广东人有饭前喝汤的习惯,科学研究表明:“饭前喝汤,胜似药方”。吃饭前,先喝几口汤,等于给消化道加点“润滑剂”,使食物能顺利下咽,防止干硬食物刺激消化道黏膜,从而有益于胃肠对食物的消化和吸收。吃水果也是如此,饭前比饭后更有营养,更具科学性。
若饭前不喝汤,吃饭时也不进汤水,则饭后会因胃液的大量分泌使体液丧失过多而产生口渴,这时才喝水,反而会冲淡胃液,影响食物的吸收和消化。所以,营养学家认为,养成饭前和吃饭时喝点汤水的习惯,可以减少食道炎、胃炎等的发生。但吃饭时将干饭或硬馍泡汤吃却不同了。因为汤泡饭饱含水分,松软易吞,人们往往懒于咀嚼,把食物快速吞咽下去,这就给胃的消化增加了负担,日子一久,就容易导致胃病的发作。
各种水果的共同特点是富含各种营养物质,食用后对人体健康大有益处。水果的主要成分是果糖,无需通过胃来消化,而是直接进入小肠就被吸收。而米饭、面食、肉食等含淀粉及蛋白质成分的食物,则需要在胃里停留一段时间。如果进餐时先吃饭、菜,再吃水果,消化慢的淀粉蛋白质会阻塞消化快的水果,所有的食物一起搅和在胃里,水果在体内高温下,产生发酵反应甚至腐败,出现胀气、便秘等症状,给消化道带来不良影响。含鞣酸成分多的水果,如柿子、石榴、柠檬、葡萄、酸柚、杨梅等,不宜与鱿鱼、龙虾、藻类等富含蛋白质及矿物质的海味同吃。同吃后水果中的鞣酸不仅会降低海味蛋白质的营养价值,还容易和海味品中的钙、铁结合成一种不易消化的物质,这种物质能刺激胃肠,引起恶心、呕吐、腹痛等。所以营养专家建议,食用了这些海味,应间隔2~3小时后再享用水果。人们正确的进餐顺序应为:汤→蔬菜→饭→肉→半小时后再食用水果。
2007-12-12 15:27:46 | 阅读(3567) | 评论(9)
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