- Berries, walnuts, mushrooms and grains contain key compounds to keep healthy
- A varied whole food diet can reduce the risk of conditions including heart disease, diabetes and high blood pressure
- Daily consumption of berries has been found to improve memory, movement and reduce risk of cardiovascular disease
Vital Signs is a monthly program bringing viewers health stories from around the world.
(CNN)Dietary supplements and so-called "superfoods" have become big business in the food, health and sports nutrition industries, bringing connotations of health, wellbeing and overall improvement -- both physically and mentally.