What should be the focus of my diet and what should i avoid completely if i want to increase my mental and physical endurance? any specific food? thx.

Plant based foods: The focus should be plant based foods with wild fish like salmon eaten at least 3 times a week. Plant based includes fruits, vegetables, beans, nuts, seeds, and whole grains. Avoid processed foods high in saturated fats with added sugars, particularly high fructose corn syrup. All types of berries and exercise have been shown key to good mental function.