help a fat cat?

I've had my cat for at least 4 months now, and in that time, she has gained
at
least 3 pounds. I am single. My cat is indoor-only and it is now winter.
I'm
thinking maybe the weight gain is because she is less active during the
winter,
and maybe will be more active during summer. Does anyone have cats whose
weight fluctuates in that pattern?

If not, how do I help my fat cat? I've tried feeding her less, but she
only
gets more annoying begging for my food. And she always reminds me (early)
when
its time to feed her. What do you do?

My cat was born in March 2002, and she weighs probably about 14-15 lbs for
a
medium-size cat (Russian Blue).

A co-worker tells me that since I don't turn on the heat in the house, it
is
normal for a pet to store body fat to stay warm, and shed that fat during
the
warmer months. Does anybody else observe this phenomena with their pets?


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