As you age, your metabolism will naturally slow down. Let that sink in for a second.
This means that unless you change your lifestyle, expect your body to increasingly become out of shape.
There are many gimmicks for losing weight; many of them, you can actually find online; however, none will help you long-term.
Changing your lifestyle doesn't have to be drastic or cost a fortune; it's all about having the right attitude and being consistent.
Here are a few things you can start doing to help lower your body fat (that's your actual goal):
Add more green vegetables to your meals. No need going on some fancy dieting program and such. Check what portions of your meals are green vegetables.
Add more fruits (not fruit juice) to your snack time. These keep you satisfied and reduce your cravings.
Drink more water. If it's too tasteless for you (one of the reasons people drink soda), add lime (or some liquid flavor) to give it some taste. This will cut down on the amount of sugar consumed as well as increase your hydration (which is good for weight-loss).
Your consumption is usually the first lifestyle you need to adjust. Once you start with those simple things above, you will actually start seeing results in your weight.
Now, your energy expenditure needs to increase. You don't have to do drastic things either.
Be more active (this is actually easier done than said).
Climb stairs instead of elevators. Don't rush yourself; go at your own pace. Enjoy the feeling of climbing the stairs.
When parking at work, stores, etc., don't park close to the entrance. Park farther away and enjoy the walk.
Power-walk. Instead of walking leisurely for 30 mins, power-walk (walking as fast as you can) and reduce the speed when tired.
If you can, bike more than drive. If that's not an option, walk more.
If allowed at work, alternate between standing and sitting while working. If allowed, supplement your chair with a ball and alternate between them.
There are still more things you can do; however, incorporating these few changes into your daily life will result in a wonderful transformation of your body (as well as provide you more energy for the day.)
I personally believe in exercising immediately after waking up. After waking up, if you can stretch for 5 mins (or perform 10,20,30 push ups), you'll realize how much energy you'll suddenly have in the mornings.
Sleep well. Stretch in bed if you can; it's fun.
Have fun with the new lifestyle. If you're forcing it and really uncomfortable with a step/plan/process, find an alternative that'll give you the same benefit. You can't lose weight long-term without enjoying what you do.
Eat cakes, pizzas, and soda. Yes, you can eat those......just not everyday. Eat them when you crave them and if you realize you're having it too often, cut back. If you find healthy alternatives to give the same benefit, go for them. Have fun with it.
Short-term weight loss programs have you doing many drastic things at once. If it's something you would like to try, I'd recommend the Insanity or P90X videos. Those will bring your weight down fast; however, it's hard to maintain the intensity for a long time.
All in all, have fun with whatever program you decide to go with. Part of losing weight is enjoying life and having fun with it. :)