Dear Erica,
Thank you very much for your letter. I agree that eating healthy food is very important. In my family, we eat a lot of vegetables, fruits, and whole grains. My mother usually cooks our meals, and she is very good at making healthy dishes. I last ate fast food about two weeks ago when I was very busy and didn't have time to cook. I try to avoid fast food because I believe it is not good for my health. Thanks again for your letter. I look forward to hearing from you soon.
Best wishes,
[Your Name]