7. Tuna. Tuna is loaded with protein and heart healthy fats, so it’s a great choice when hunger strikes during the day. Start with a large romaine lettuce leaf on a tortilla. Add a couple spoonfuls of canned tuna on the lettuce. Layer on matchstick carrots and cucumbers, season it with salt and pepper, then roll it up. This one is similar to a sushi roll, without all the creamy sauces that make it an unhealthy choice.