So have that apple and offer one to your co-workers. I have found it more difficult to keep the weight off. I work out three to four times a week and watch what I eat, but it has become increasingly more difficult to stay fit. Your body changes over time, and it is good to re-evaluate your diet periodically, because your needs can change. If your weight is creeping up, keep an accurate food diary for a week.
Weight training builds muscles and therefore increases metabolism.
Aerobics burns fat. Try to vary your aerobic routine so you can use different muscle groups to help keep your metabolism up. I have read that foods high in fiber are good for those wanting to shed a few pounds. Fiber helps lower cholesterol and control blood sugars. Fiber adds bulk to your diet and helps make you feel full.