Translation of "Ayunar" in English

Es ayunar como desafío para su cerebro,

is fasting is a challenge to your brain,

Bien, ¿por qué ayunar fortalece la potencia cerebral?

OK, why does fasting bolster brain power?

Y algo que sucede al ayunar, que no sucede

and one thing that happens when you fast, that does not happen

Ayunar o no comer, ese ha sido su gran error.

Your fasting, your not eating, that has been your great error.