Ideas of things to eat:

Breakfast:
--Cottage cheese and whole-grain, low-fat crackers
--Oatmeal with peanut butter stirred in
--High-fiber cereal (Cheerios, most of the Kashi cereals, bran flakes, shredded wheat)
--Eggs (or egg substitute for lower calories) with low-fat cheese and vegetables (or salsa)
--Low-fat, high-fiber toaster waffles (we have Eggo Nutri-Grain waffles here in the States) with sugar-free syrup or strawberries mashed with a bit of Splenda

Lunch/Dinner:
--1/2 of a potato topped with low-fat chili or broccoli and low-fat cheese sauce (Green Giant makes these here in the States--they're sold in boxes with the frozen vegetables)
--chicken or lean beef fajitas (grilled meat with grilled,spiced vegetables wrapped in tortillas. Corn torillas are usually better for you than flour. Either way, look for small, low-fat tortillas)
--Spaghetti squash. Purchase 1 medium spaghetti squash, wash well, cut in half, scoop out seeds, prick with a fork, and microwave. Start checking for doneness at 10 minutes. Could take between 10-20 minutes--it's done when it's tender and a fork passes through easily. Once done, use a fork to pull out the meat of the squash in strands. It should resemble spaghetti. Once you have all of the meat out, you have a couple of options. You can toss it with chicken, garlic, and olive oil or you can combine it with a low-sugar marinara sauce and reduced-fat sausage or parmesean cheese. Spaghetti squash is very low-calorie, high-fiber, and full of vitamins.

Snacks:
--string cheese or reduced fat cheese
--Nuts, especially almonds, cashews, and pecans. Try honey-roasted nuts if you need something sweet.
--celery sticks with reduced-fat Laughing Cow cheese spread
--raw vegetables with reduced-fat ranch/onion dip
--low-fat microwave popcorn. Consider adding a tablespoon of real melted butter. It adds about 100 calories, but it helps keep you satisfied longer and feels very decadent. It's a nice treat.
--baked tortilla chips with low-fat bean dip


Also, one of my favorite, super-easy recipies. It's low fat and high-fiber.

Six-can Tortilla Soup

2 cans chicken broth
1 can diced tomatoes, undrained (plain or chili flavored)
1 can corn, drained (Mexicorn if available)
1 can black beans, rinsed
1 can chunk chicken (or whatever leftover chicken you have lying around, diced.)

Mix the contents of all cans in a large pot. Simmer at least 30 minutes. Feel free to make ahead, this just gets better as time goes by.

Again, good luck!