Wow! thankyou, great advice. I'm thinking I might try something similar. I started going to a gym 3 times a week 2 months ago and will keep that up but I'm basically eating good healthy foods for morning and lunch. it's when i get home I go off the rails and I sit watching tv diving into a bowl of popcorn or having bread. I could continue this pattern and closely monitor for weight gain and if it starts to creep up, then I'll have to pull back in the evenings, or try your approach with controlled days and not so controlled weekends.
Thanks for the tips - as I said, never had to really hold steady with my weight before (my BMI is 40) so I dont want to go too far under either.