Think of meat, poultry, and fish as side dishes, to be consumed once a day, instead of at every meal. Use the government's food pyramid to create a diet weighted towards vegetarian foods. Not everything is labeled, of course. It's always worth noticing the number of calories provided by fat in something you're about to eat. This can really make a difference.
Skim milk has virtually no fat at all.
Forget about cooking in and basting with fats and oils. Always trim all visible fat from meat, and discard poultry skin. Watch calories and portion sizes. It is possible to mess up a low-fat diet. Most low-fat diets are low in calories, but not all are.