This sentence asks for changing the sentence from the simple present to the present progressive. This last tense is used to talk about something that is happening now. We form the present progressive by using the verb estar plus a present participle. So the formula is <em>estar + present participle. </em>Therefore, estamos is the conjugation of the verb estar for the first person plural in the simple present and escribiendo is the present participle of escribir.
You can write for the benefits this: Yo pienso que la comida Mexicana tiene muchos ingredientes saludables. La comida mexicana tiene mucha proteina y muchos minerales y vitaminas. Yo creo que tambien ayuda con la pression y con el cholesterol. Es rica en fibras y muy saludable para darle a la familia. Es muy facil hacer tambien.