Switch to a grain free food and the weight will come off without you doing anything. I switched to Taste of the Wild 3 years back, and within 6 months they were all down (except Crystal, that is a separate issue).
Cats in the wild do NOT eat grains! (Unlike dogs, who do eat some grains) Read the ingredients label. Learn what to look for and what to avoid, here:
http://www.petfoodratings.net/cattable.html
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