Diet is the most effective method to lose weight, in most cases.  However a mixture of both can be very effective, with healthy foods such as vegetables and fruits making up a large portion of your diet, and light exercise such as going for a daily walk, or committing to some type of light exercise regiment.  It is not recommended to go straight to heavy exercise, especially if you are not used to it and/or your weight is significantly higher then an average person of your height. Hope this helps!
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