Do some research on dieting. Check out especially the low carbs, higher protein type dieting models (South Beach, Atkins, etc) and the recommendations from places like mens health etc. Let it all filter thru and then start looking at what will work with your lifestyle, schedule, etc.
Also, remember that ultimately, sugars are simple energy sources, so are processed quicker. Proteins and fats tend to take longer to be broken down and absorbed, therefore, if you want to get longer lasting energy, with the same number of calories, you need to make sure you have a higher proportion of your calories from non carb sources...
Also, do a search on weightloss here, there is lots of info about what has worked for diff people. But, the bottom line is always, fat loss comes when you consistently burn more energy than you eat, but you still need to ensure all nutrient types are provided..
Stu the crazy bass from down under
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Polar bears for Obama!!