There’s no magic bullet to boost IQ or make you smarter — but certain substances, like caffeine, can energize and help you focus and concentrate.
Found in coffee, chocolate, energy drinks, and some medications, caffeine gives you that unmistakable wake-up buzz — though the effects are short term.
Dark chocolate also has powerful antioxidant properties, and contains natural stimulants like caffeine, which can enhance focus and concentration.
but Overdose of caffeine can make you jittery and uncomfortable.
Sometime we become addictive to such caffeine based food , and unfulfilled requirements leads to headache, insomnia, mental disorders, anger n so on.
So Drink coffee / caffeine based drinks, eat chocolate to njoy it taste. But never be addictive of it.