When Honey and Libby eat, Honey is always served low-fat food
and Libby is always served high-fat because, let's face it, Honey's fat and Libby's thin.

But Libby does not LIKE high-fat food, because she likes meat better than wheat.
So she makes Honey get out of the way and eats all of her food. Honey doesn't even meow her pitiful "Mat" sound o even a "Moo". She just waits.
Once Libby leaves, Honey eats all of her High-fat food, purring all the while.

It's pretty impossible to put Flabby Tabby on a diet, but oh well...