If you want to lose weight, it's simple math — to lose one pound a week, you must burn approximately 3500 calories over and above what you already burn doing daily activities. That's about 500 calories a day that you need to either cut out or burn with exercise. Let me say this out loud: Skipping meals doesn't count.
If you skip let's say Breakfast, or decrease your calories significantly (to less than 1000 calories a day), you're not helping your body lose weight. You're actually decreasing the rate of your metabolism. You go into "starvation mode" where the body tries to compensate for the low calories. Your metabolic rate can actually decrease as much as 10-15%, and your body will hold onto the fat and burn lean muscle instead.
Skipping a meal also makes you really hungry, so when you do go to eat your next meal, you'll probably end up overeating, which also won't help you lose weight. Try to reduce your daily caloric intake by 250 calories and burn the other 250 calories by working out. Try passing on that extra slice of pizza at lunchtime, and take a walk.
Fit's Tips: Don't let yourself go hungry. Eat throughout the day, making sure to eat 3 meals a day, and include small, healthy snacks in between.