Hi,

I don't think I've ever had that problem, but only because I've always made an effort to really mix it up. I think all I can suggest is that you expand your menu. A few protein suggestions for variety:

-turkey instead of chicken, or try a different cut
-ground chicken or turkey
-ground beef
-deli meats
-fish: canned tuna, fresh fillets, frozen ready-to-bake
-vegetarian products: try some tofu, soy sausages, bologna, etc
-protein powders and shakes

Meat suggestions:
-try making soup or chili, instead of just eating plain meat. I know that gets boring.
-cut pieces up in a salad
-make a cassarole with veggies and pasta sauce

HTH. Good luck.