1. Spinach

All leafy vegetables share a richness in Vitamin B9 (or folates), which is known to play an active role in the development of a foetus’ nervous tissue and also in the renewal of blood cells. One of the signs of Vitamin B9 deficiency is reduced awareness and memory deterioration. This phenomenon, observed in people of advanced age with folate deficiency, can probably be explained by the fact that Vitamin B9 is needed for the maintenance of dendrites (arborisation of neurons, where B9 levels are high).