as the rapid advance of economy, food has become easier to prepare than the past time when people make it hard to touch a bowl of noodles. it is could be seen any supermarkets that various canned food are on the shelf.from my personal perspective, this change improve people's life greatly but not essentially. for this progress brings many advantages meanwhile leads to some harmful problems.
first of all, easy preparation of food means most of us can make our own meals in the flesh, which bring us a lot of confident and content. for example, lunch made by our parents always tastes more delicious than food in students' canteen.  children could get proud and parents also become achievable at the same time. secondly, take office workers as a example, usually, they lack time to enjoy one meal, and some fast food restaurant could be the best choice for them, nowadays, an increasing number of snack bars have risen up, such as KFC, mcdonald's, which satisfy people's require. therefore, people could save their time to get work done. what's more, people could have a wider option of food types because of the simple preparation of meals. in a sense, our life get improved with the change of food's preparation. 
admittedly, it could also present  some disadvantages,  which accompanys this change. an illustrating example is that many canned food containing more and more additive flow into the markets，resulting in many physical problems,additionally, people can not obtain a balance in nutrition, especially growing juveniles. therefore,