-According to Sousa (2016), brain cells consume oxygen and glucose (a form of sugar) for fuel. The more challenging the brains task, the more fuel it consumes. - According to Kumar et al (2016), low amounts of oxygen and glucose in the blood can produce lethargy and sleepiness. -Also from Sousa (2106), water, also essential for healthy brain activity, is required to move neuron signals through the brain. Low concentrations of water diminish the rate and efficiency of these signals. Moreover, water keeps the lungs sufficiently moist to allow for the efficient transfer of oxygen into the bloodstream. Based on those facts, provide pieces of advice for: -Students preparing for exams -Sports players mọi người giúp em với ạ ;-;