Try tuna for dinner tonight. Tuna is a nutrient-dense food rich in high-quality protein and important nutrients like selenium, magnesium, potassium, B vitamins, and omega-3 fatty acids. It provides vitamin B6, vitamin B12, phosphorus, niacin, and selenium. Phosphorus helps create and manage energy, synthesize protein, fat and carbohydrates, contract muscles, and maintain fluid and electrolyte balance. If not tuna, chicken is also a nutrient-rich option dense in protein, zinc, iron, phosphorus, riboflavin, thiamine and niacin.