If they were good enough for your grandfather, they're good enough for you. Ventrelle acknowledges sardines have a reputation for being "slimy little guys packed in a can that give off a loud odor," but says if you can get over the smell, your brain and heart will benefit from the omega-3 fatty acids. Sardines are also a source of lean protein and vitamin B12 for healthy nerve cell maintenance, and are one of the few food sources of vitamin D, which plays a role in calcium absorption and immune function. Try mashing a tin of them with dijon mustard and minced onion, and spread it on whole grain crackers. One cautionary note: If you have high blood pressure, you may want to limit intake. Sardines are very high in sodium.