根据下表提供的数据,写一篇说明文,简述过去几年来某地区人们饮食结构的变化,以及这些变化带来的益处。
Changes in People’s Diet
| year food |
1998 |
1999 |
2000 |
2001 |
| Grain |
45% |
44% |
43% |
40% |
| Meat |
23% |
21% |
20% |
18% |
| Fruit&vegetable |
20% |
22% |
23% |
26% |
| Milk |
12% |
13% |
14% |
16% |
| Total |
100% |
100% |
100% |
100% |