I would reccommend a version of the 70s classic- the Scarsdale diet! It's a bit grim but manageable and you do shed the pounds! I did it for 2 weeks but by the 2nd week I was having trouble swallowing the brussels so abandoned it! A week is long enough! This is a quick summary:-
Breakfast- wholemeal toast (1 slice) & 1/2 grapefruit (or other 'seasonal' fruit!)& tea/coffee
Lunch - fruit salad or
tuna, lettuce, tomato, cucumber or
cheese on wholemeal toast or
more fruit salad or
cottage cheese, green beans, boiled eggs
Dinner - chicken, salmon other lean meat cooked in roasting bag in oven (use lemon juice, olive oil to favour) & as much green veg/salad as you can possibly stomach!
No milk/sugar in tea/coffee