Although there are many causes for fatigue and low energy, the most common cause is adrenal dysfunction. Adrenals are the glands that sit atop the kidney (renal). These little glands regulate numerous hormones and help you deal with stress. Interestingly, the biggest stress on the body is blood sugar fluctuation, which regularly overworks the adrenal. Emotional, physical and mental stress are contributors too. For most people, simple in office exam tests can detect and allow you to see immediate changes in function after easy treatment.
Other energy zapping conditions are hypothyroidism, insomnia, sleep apnea, food sensitivities, general nutrient depletion and poor diet. Occasionally we must run laboratories to rule out anemia or other more insidious conditions. Most conditions are readily helped.