Помогите пожалуйста написать письмо другу на тему «как изменилась…

Dear friend,i am glad that you wrote to me previous letter.In our days lots of people use fast food,they think that it's normal food,but unfortunately this food is very bad for our health (But some years ago people used other food.they liked food that was prepared by their parents or buy themselves! People forget that there is other food and we can eat better.But why do people use fast food? Be cause in our days.in our modern life we have a little time… .so… we don't have time to prepare food.Modern world is changing and unfortunately fastfood become usual thing!