Prunes Including prunes in your diet can help to improve your hair texture as well as proper bowl movements. As it is rich in iron, it helps prevent hair loss, dull hair, thin hair, and discoloration of your hair.A prune is a dried plum of any cultivar, mostly Prunus domestica or European Plum. The use of the term for fresh fruit is obsolete except when applied to varieties grown for drying. Most prunes are freestone cultivars, whereas most other plums grown for fresh consumption are clingstone.