Caroline Mason of Baldo & Mason nutritionists in London has the lowdown. Green, Leafy greens: Spinach, kale, collard greens, and broccoli are rich in B vitamins, folate, and magnesium, which play crucial roles in neurotransmitter production and stress management. "Avocado offers healthy fats, vitamin B6, and fibre all of which support brain function and emotional regulation."