Plain and simple:
Eat lots of fruits & veggies. Eat as few processed foods as possible. Eat nuts. Drink water - 1 oz of water per 2 lbs of body weight. (I weigh 160 & drink 80 oz/day) And exercise with increased heart rate for at least 30 minutes 3-5 days per week.
Drawn out & long-winded:
Repeated periodic exercise is best. The best advice I can give is to work out a little at least three to five days a week, but be sure to raise your heart rate, and keep it raised for a sustained period. I would say that just 30 minutes in a day regardless of when it is would be adequate, but there may be something about hormonal levels or body chemicals that might make morning runs more productive time spent for you, plus it's a great way to wake yourself up.
Cutting unnecessary carbs and sugar is good advice, but you don't need to horribly deny yourself unless your metabolism is really slow. As a rule most of your food should come from plants - fresh fruit and veggies are the best. Clean and good fatty protein like nuts - cashews, almonds etc will help tide you over and give you good omega fats which also help reduce cholesterol. A handful (8-20) of almonds will tide me over for at least an hour - and the eating of fruits and veggies (avoid corn as it's mostly just sugar) of all shapes and colors will keep you grazing all day long on high quality, high nutrient, but low calorie foods and the nuts keep you sated. There's a place in there for lean meats too, but meat calories should only account for maybe 20% of your intake - this isn't dieting advice - but everyday, everyone should cut down on the meat consumption advice - especially stuff like burgers and bacon. Those can be great for a BBQ or something, but no one should be eating red meat or fatty meat every day. Our bodies aren't meant to eat like that.