Chinese Medicine has long seen walnuts as a yang tonic, capable of promoting male sexual health. BBC News reports on research suggesting that walnuts can improve sperm quality, possibly due to their content of a-linolenic acid, an omega-3 fatty acid.
Walnuts 'improve sperm health' (BBC News)
Eating around two handfuls of walnuts a day improves sperm health in young men, a study in the journal Biology of Reproduction suggests.
Sperm shape, movement and vitality improved in men who added walnuts to their diet over 12 weeks.
The fatty acids found in these nuts are thought to have helped sperm development. It is not known if this would help improve male fertility.