General tips
Buy Local Food : Strawberries, blueberries and many other kinds of fruit often are available from farms that allow you to do the harvesting (or not, if you prefer to pay for the cost of picking). Many fruits are easy to freeze, and apples will keep all winter in a cool corner of the garage.
When you are travelling, you should have a quick think about where your food has come from. When/if it is locally produced, your food is likely to be tastier, better for the local economy and fresher.
Diet types
The Glycaemic Index Diet
The gi (or glycaemic index) weight loss program is based around the glycaemic index, a list showing foods and an indicator of the ease with which the energy of the food gets transformed to sugar in the dieters blood stream. The theory is that slow release food types (ie those foods with a low Gi score), keep you satiated for longer and help you to consume less food without starving yourself.
It's also extremely useful for individuals with diabetes, as the low GI food types are useful in minimizing surges in blood glucose amount.