I don't think we are supposed to go by calories, protein first, then veg then carbs if you have room. BUT I have 12-1300 cals a day and exercise 4+ times a week for 30 minutes, it helps me keep track of what I'm doing.
xxxx sharon
ps As you can see I haven't lost loads coz I went through a very bad depression during Summer and gained a lot, which I've now lost again...I had no restriction but after my last fill I'm feeling a lot 'fuller'.