Today, when we srolling on the road, we could see many fast food restaurants open 24 hours, so you can get a meal regardless the time.  What's more, there are so many semi-finished food in the cities' supermarkets. All of this things do really free our family members, especially our mum, out off the kitchen. Let us have more time to go work and do what we are interested in. As I am concerned, in some extent, the changes of food improved our living standard.
Easier obtained food spur the development of economics. Because food is the basic luster that people persuit, it is foundamental. In 19th, the invention of can gave Holland the ability to became a big country. Since in the ocean which coast Holland, there are many kinds of fish. But, at first,  Hollander confused that though they could cought so much fish, most of them went bad, since they did not known how to protect them. The invention of can just in the appopriate time. Another invention we could not be familier any more-refrigirator. It is a further step in protecting food. Both can and refrigirator are reduced the food which because of went bad, people thrown away.
Also, food became easier prepared reduced our time. As we all know, in today's society, time is so important that we could not to describe. For example, we could eat some fast food at work place instead of went back home at make a lunch which would wasted our time. And we also could bought noodle in supermarkets which in the past we could only make them by ourselves using flour.
But, the development of food also has some side effects. First, people are become lazier than before, because they thought they could get food even they not to cook. More seriously, many diseases arisen because of the bad eating type, such as hypertention, diabetes.
All in all, I think we should use the efficiency of easier prepared food. But, if we have time, it is a good choice to go to kitchen and cook a healthy meal for your family.