Pork tenderloin. This is so easy to make and so low in calories, but I do definitely get tired of it, even the pre-seasoned ones. The serving size always seems a little small and it's low enough calories that I can practically double it and still be well within my calories but I've learned that this is a mistake. It always ends up being too much pork.
I also get tired of fish in general. That fishy flavor can really get to me; sometimes I just need to take a break (except for sushi--I swear I could eat sushi morning, noon, and night and never get sick of it).
Here are a couple of ideas for your tuna that might make it more interesting:
- Tuna mixed with mango (fresh is best, but frozen mango works as well), a very small amount of olive oil, cumin, and cilantro. Serve over avocado or in your fav low cal wraps.
- Tuna mixed with hummus and roasted eggplant in 1/2 pita. You can also add some tomatoes and cucumbers if you want.
- Tuna mixed with tomatoes, two types of beans (kidney, pinto, garbanzo, black, whatever you like best), grilled or raw onion, fresh oregano, basil, and cilantro, salt, pepper, and a dressing of dijon mustard and red wine vinegar. This is best if you wait until summer when you can get farmers market or home-grown tomatoes. I don't think it would be very good with grocery store tomatoes.
Sadly I NEVER get tired of carbs, especially not breakfast cereal. I could also eat breakfast cereal morning, noon, and night along with my sushi. If I gave myself the chance, I could finish off an entire box in one sitting. Everyday when I finish my morning bowl of cereal I think "Oh no! Is that all there is?

" And it's Kashi Go Lean, which doesn't even taste that good. But I still wish I could have more.
Luckily, I also never get tired of fruits and veggies or chicken.
