西方人大多以肉为主食,这些食物含有高的饱和脂肪，容易患高血脂、冠心病等。同时，由于西方人对蔬菜的摄入量不足，维生素b、c等及膳食纤维易缺乏。优点的在动物食物中含有丰富的优质蛋白，易于被人体吸收。热量充足。
中国人的饮食多以植物为主，主要是以谷类为主食，不易缺vb1，膳食纤维量足，大多数的优质蛋白来源于豆类。缺点是脂肪类太少，而且过多的膳食纤维的摄入易引起钙等矿物质的丢失。
写一篇介绍中西方饮食习惯差异的英语短文
there is another interesting custom in western countries about taking leave of one's host at parties.if guests want to leave,their leaving time should be 10 or 20 minutes after their first saying goodbye. and during this period,guests need to repeat it 2 or 3 times.guest also need to show their thanks to hosts, and hosts express their hope of reunion.
