Tuna is lean fish, so like meat, it’s chock full of protein and low in fat. If you’re eating the canned ones too, opt for tuna in water rather than in oil to ensure the best protein content.
Avocado is rich in oleic acid, which is the same fat found in olive oil. It also contains a lot of water, so it isn’t as energy dense. With that, it’s ideal for weight loss diets.