What has caused the great changes in people’s diet? The main reason, I think, lies in the improvement in people’s income level. With the development of our society, people are becoming richer and richer, which enables them to purchase more nutritious food such as meat and milk. In the meantime, grain consumption in people’s diet consequently dropped.
　　So from the analysis, we can draw a conclusion that our society is progressing and people are living a better life than ever before. We are now able to purchase more delicious and nutritious food, resulting in an improvement in our health.