I have only seen cats get fat after neutering, and that was when it was done too late, after 8 months old. It happened to two of my childhood cats, they got to be almost 20 pounds! But another cat I had done at 4 months he stayed nice and lean.
Anyway, you should do it, it's better for them.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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