Please find below an answer I gave to a similar question that I know is useful, effective and deserves to be repeated. I think you will find this very helpful.

The answer is so simple few people do it. Every fitness magazine rewrites the same "advice" over and over disguising it as a "new discovery" or "top 10" list. Every fitness magazine also contradicts itself during different fad cycles. Some fads are: low / no carbs (we are currently in but slowly coming out of this one now), low /no fat, all fruit, high protein, ect.)

Here’s how you reach your goal and sorry for being so uncomplicated. Eat less calories per week.
From a scale weight stand point, it does not matter where these calories come from. Eat as you are right now (assuming you are enjoying what you eat). A relatively painless way to cut the calories you need to per week is doing one or more 24 hour FASTS a week. This is a common health practice (some due to religion) in most of the world except North America. Pick one day per week and stop eating at 6pm (sleep will consume a lot of those 24 hours without you knowing it) until 6pm the next day. Then eat as you normally would. Depending on your daily caloric intake, for me this shaves aprox. 3000 calories from my week which equals about a pound of fat loss.

If you are looking to keep you energy levels up and enhance the effects of the fasts, I would also recommend a great all natural herbal supplement with hoodia in it. This is the one I personally use:
http://www.hiderefer.com/qz11g0gH.htm

With this combination I have lost 18 pounds in 5 weeks including 3.5 inches off my waist. My energy and mental focus are at all time highs and I am never hungry.

You will succeed.
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