When you feel as if you're always dealing with depleted energy reserves and fatigue, it may be more than a long list of errands or dehydration wearing you out. Lack of energy is a common symptom of depression, along with extreme sadness, difficulty concentrating, loss of appetite and low-quality sleep. Of those who seek medical attention for ongoing energy loss or fatigue, about 20 to 40 percent are suffering from depression or anxiety [source: Harvard].
We've already highlighted how a bad night's sleep can zap energy, but when you add in some of the other symptoms of depression, it's easy to see how the disorder becomes an energy suck. One way that most people recharge their energy batteries is by engaging in pleasurable activities, but depressed people lose the taste for activities they used to find enjoyable. Additionally, people suffering from depression can get caught in a web of negative thoughts, which makes it even harder to get up and exercise, to eat healthier or to make an effort to deal with stress at work or in the home.
Treatment for depression is available, but it may be hard to avoid our No. 1 energy zapper entirely.