Caffeine does not enhance your energy level in long term. The body cannot metabolize caffeine to power your cells. Stimulants like caffeine triggers hormones release in your brain, giving you the perception of excitements and you only temporary mental alertness. The truth is you will get addicted to it and feel even more headaches and fatigue if you don’t drink it. While soft drinks are high in artificial sweeteners and sugar which may lead to blood sugar spike, making you feel more drowsy and dehydrated.