Try splitting your caloric intake into 6 smaller meals a day. This avoids the wild swings in insulin that many people experience when they only eat 3 meals a day. While insulin is an important hormone in the body, very high levels are usually not desirable since insulin can shut down your body's fat burning mechanisms. Keep a logbook of your diet. I keep a logbook of what I eat almost every day.
Many people underestimate how many calories they are really eating.
Buy a food scale to weigh out your portions of food. Try not to lose more than a pound or two a week. If you're losing weight faster than this, than you're losing muscle and not bodyfat. The slower you lose weight, the better and more permanent your results. Don't overdo the aerobics.