Avocados 
Avocados are a good source of vitamin K, dietary fiber, vitamin B6, vitamin C, folate and copper.  Rich in potassium, avocados contain more of this nutrient than bananas.  Potassium is needed to regulate nerves, heartbeat and, especially, blood pressure.  An added bonus for men: Avocados inhibit the growth of prostate cancer cells.

Blackberries
Blackberries are packed with Vitamin C, calcium and magnesium, with more than double the amounts than their popular cousin, the blueberry.  Vitamin C is a powerful stress reducer that can lower blood pressure and return cortisol levels to normal faster when taken during periods of stress.  Magnesium and calcium act together to help regulate the nerves and muscle tone. 

Too little magnesium in your diet can cause nerve cells to become over activated and can trigger muscular tension, soreness, spasms, cramps, and fatigue.  Blackberries also score high on the oxygen radical absorbance capacity (ORAC) scale assesses the antioxidant content of food: the higher the score, the better the food's ability to neutralize cell-damaging free radicals that lead to cancer.

Spinach
Spinach is one of the most nutrient-dense foods in existence.  Spinach can help protect against prostate cancer, reduce the risk of heart disease and stroke, lower blood pressure and strengthen muscles.

Walnuts
When it comes to their health benefits, walnuts are the king of nuts. Richer in heart-healthy omega-3s than salmon, loaded with more anti-oxidants than red wine, and packing half as much muscle-building protein as chicken, walnuts are one of the all time super foods.