Fish is good for your brain and heart, but many people can't afford to buy restaurant-quality cuts of fish on a regular basis. However, at about 62 cents per serving, canned tuna will give you the same nutrients in a much more affordable package. Tuna is a great source of protein and contains myriad minerals and vitamins.
Tuna provides your body with essential omega-3 fatty acids. These acids can help lower your cholesterol, control your blood pressure as well as lower your risk for stroke and heart disease. Do keep in mind that canned tuna contains mercury, so you shouldn't eat it every day.
Here's a tip -- buy chunk light tuna in water instead of albacore. It's cheaper and has a bit less mercury. Skip the mayo in your tuna salad and go with a lighter oil and vinegar dressing to make it healthy.