BasketballExercise every day! This could be the most hard step to follow. But what you can do is really start slowly then steady increase the amount of exercise. For example, today you will walk for 10 minutes, repeat this for the whole week. For the next week, double your workload. You may get leaner that way! The vital thing is to get your heart rate up and start, now!
Feed your temptations once in a while. Go ahead and have that donut or slice of pizza, but before you do, drink a few glasses of water and eat a bowl of raw veggies such as cucumbers, celery, carrots, and tomatoes. They will fill you up and you will have very small room to eat the "junk" food.

Scrumptious!Consume things that have no calories. There are two things you eat and drink that contain no calories: water and fiber. The more of these you get into your diet, the better off you will be. For example, you can eat a pound of mixed salad greens with assorted raw vegetables (carrots, red cabbage, celery, broccoli, onion, etc.) with a low or no-calorie salad dressing and only have eaten 100-150 calories. This is because of the high water and fiber content of the salad and low calorie dressing. Also, eat lots of celery. It has only 8 calories, but amazingly, it takes more than 8 calories to digest it. So, you really BURN calories by eating celery! It's not much, about 2 calories per 8 inch stalk, but it sure doesn't hurt.
Avoid sodas as much as possible. Instead, drink flavored water or unsweetened iced tea.
Take broth-based soups. They are a relatively low in calories. A commerically-available ready to eat "chicken and stars" soup may only have 80 calories for 1 serving, much less than diet "meal shakes" or nutrition bars.

These may help you.Practice excellent eating habits. Always use utensils and sit at the table. This stops you from eating precariously. Eating with your hands will mean that you take in more food in one scoop. Don't forget to eat slowly and stop when you're full. Similar to the above step, if you can't stop, drink up! Maybe your body is thirsty and hungry no more! Also, you can do any other chores (other than eating). For instance, go shopping, or play badminton with your friend, or play games on the computer!
Spread out your diet! Eat more small chunks of meals, rather than 3 huge meals. If you eat 100-150 calories or so every two hours, your body stays in a higher-metabolism digesting mode. This allows you to burn more calories than eating just 3 meals a day.[1]

Source(s):
http://centerformedicalweightloss.com/la...
http://www.smallstep.gov/?gclid=CIqXsZjb...
http://exercise.about.com/cs/weightloss/...
http://www.fourhourworkweek.com/blog/200...
http://www.netdoctor.co.uk/health_advice...