FOOD
Tuna has lots of vitamin A and several B vitamins, including B12, niacin, and B6, and 20 grams of protein per 3-ounce (85-gram) serving. These nutrients are necessary for good health, energy, and athletic performance. Furthermore, tuna contains a high concentration of omega-3 fatty acids, which might benefit muscle health.
Omega-3 fatty acids have been shown in studies to slow muscle loss and resilience with age. This may be especially important for the elderly.