Research on eating habits

Dear Dr. S. D. Allan,

I'm writting in order to take part in the experiment on eating habits, which I saw on a magazine and got interested inmediatlly.

First of all I am going to tell you my present eating habits, as you asked. I usually eat 3 meals: lunch, tea and dinner. I skip breakfast because I am used to get up too late. In general I do not eat unhealthy food, like fried food or with lots of fats.
Between those meals I eat lots of things: cookies, cake, waffles, chocolate, etc.
I was wondering if in the exepriment we can choose the food or if they're just fixed meals, and also if the food is free or I have to pay for it.

When would this start? Between Saturday and Thursday, any day is okay for me, so just tell me those three days I could go.
You also mentioned a fee, could you tell me of how much is it?

I look forward to hearing from you.
Yours sincerely,
Belén Alejo.