Junk food. I am a foreign student and this is my essay about junk food, can you correct it?

You seem to be doing well learning English. Here are my corrections: The second sentence could be rephrased as "Our moms and ourselves never have enough time to cook healthy food" so it would make more sense. Instead of "si" it should be "see". "Realise" should be "realize". Also, generally we would say "cooked fast" instead of "fast cooked". Add the word "it" between "eating" and "because" in the 5th sentence. In the 6th sentence use "mostly" instead of "most of all" and I'm not sure what "don't change the cooking enough" means. Use "lifestyle" instead of "style-life". I would rephrase the last sentence as "Teenagers must be very careful if they want to live a long and healthy life". Other than those things I thought it was pretty good, better than anything I could write in another language. Nice job!