Water, water, water. Peaches, plums, sweet potatoes, lots of fresh fruit and or veg.
Look up oatmeal/pumpkin recipes. Pumpkin is full of fiber and the oatmeal is not sugary, and also a reasonable source of fiber. A splash of vanilla and some light vanilla soy milk, a little cinnamon will make it tasty.
I make a light coleslaw, with cabbage, fat free mayo, and a bit of Splenda. If you like slaw.
You can add grated zucchini to anything!

Plus this time of year, if anyone around you gardens or there is a farmers market, they are cheap! You can great them and freeze it for later.
Dry edible beans, like the ones in beans and ham. You can buy them already cooked in the can. I do rinse them because of the salt. Add a few to salads. They are also a good source of protein.
Basically, lots of your choice of fruit, veg, squash, pumpkin, sweet potatoes, dry edible beans and water.
If you're not exercising, it does help, by getting your metabolism moving. Even just a "brisk" 20 minute walk, get your blood pumping, your heart rate up. Sweat a little.
Hope that helps!
