Essay: food preparation and life improvements

I've set out my view in this essay as a part of my preparation to IELTS exam. If someone corrected my grammar mistakes and style, I would be very grateful.

Question:
Nowadays, food has become easier to prepare. Has this change improved the way people live? Use specific reasons and examples to support your answer.

Answer:
For the last 50 years, the ways, which used for food preparation have changed significantly. Nowadays we have many special tools and technologies for cooking, and it became possible only with development of related branches of science. As a result, our relation to food and cooking have changed, and of course it interacts with our daily routine.

There are a number of arguments to support that claim. At first, now we can prepare our food more easier and faster. Many new devices have occupied our kitchens, such as microwaves, toasters, food processors. It takes only several minutes to prepare a breakfast, so we have more time for some other activities. Moreover, now we can use a ready meals, and this invention allows to extremely rise the variety of food that person could people can prepare at home. Secondly, since we can preserve our food much longer than in the past, we can plan food shopping in more convenient way. And many families nowadays prefer to go to the supermarkets once a week.

On the other hand, it can be said that we should not review all this contemporary improvements individually. All surrounding technologies just the part of more global development process. Is cooking preparation is more easier nowadays? Definitely yes. But the public transport and, for example, communications is also became more effective. New technologies make our life easier and various upgrades in cooking is just an example.

In conclusion I would like to say that our daily life have significantly changed in 20th century. These changes involve many aspects of our life, and food preparation is one of them. As a result, new modern devices allow us to spend our cooking time more effectively.