BAD PUNS XXII

From Reader's Digest
Contributed by Karen Bellecci 

Can you supply the bad pun at the end of this story?

While visiting one of my ever-dieting friends, I noticed that she finally had lost an appreciable amount of weight. As she listed the merits of her new protein diet, her husband silently steered me to the refrigerator. Pointing to at least a dozen cartons of cottage cheese, he sighed, "All she does is ........................

Answer:

eat her curds and weigh.