Some key nutrients to make sure to include in the diet are:

B12- for creating red blood cells, and maintaining healthy nerve function.
Calcium, Vitamin D, and Potassium, for maintaining strong bones and the prevention of osteoporosis and rheumatoid arthritis.
Fiber for healthy digestion.
Omega-3 Fats for heart health and to reduce the risk of Alzheimer’s disease.
and
Water is always crucial for good health, especially when increasing the fiber in your diet.