Water - might be stating the obvious but keeping hydrated will keep you focused and improve all brain functions such as memory or even creativity. Green vegetables – especially the leafy green veggies, they contain antioxidants, vitamin B and folic acid. This is all your brain needs to be at its best! Blueberries – the antioxidants contained in blueberries help with concentration, memory and mind clarity. Oily fish - Omega-3 contained in some fish such as trout or salmon are favoring mental performance, concentration and memory. Avocado – it’s known to stimulate blood flow and thus boost mental functions. Dark Chocolate – thanks to the magnesium contained in dark chocolate, you’ll feel less stressed as you’ll release endorphins. Nuts – full of antioxidants and vitamin E that will improve your focus and prevent from cognitive diseases. Coffee and Tea – caffeine and theine will indeed rise your alertness and focus for a short period of time.