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  2. Depleted energy levels affect us all. But here's when they ...

    www.aol.com/depleted-energy-levels-affect-us...

    Of course, sometimes a lack of energy can be a symptom of an undiagnosed medical condition. Anemia is one such condition and is related to an iron deficiency that makes it harder for the body to ...

  3. Fatigue - Wikipedia

    en.wikipedia.org/wiki/Fatigue

    A 2009 study found that about 50% of people who had fatigue received a diagnosis that could explain the fatigue after a year with the condition. In those people who had a possible diagnosis, musculoskeletal (19.4%) and psychological problems (16.5%) were the most common. Definitive physical conditions were only found in 8.2% of cases. [128]

  4. Lethargy - Wikipedia

    en.wikipedia.org/wiki/Lethargy

    Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression , decreased motivation, or apathy . Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom , or a symptom of an ...

  5. Excessive daytime sleepiness - Wikipedia

    en.wikipedia.org/wiki/Excessive_daytime_sleepiness

    Causes Narcolepsy , idiopathic hypersomnia , circadian rhythm sleep disorder , sleep apnea , others Excessive daytime sleepiness ( EDS ) is characterized by persistent sleepiness and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep.

  6. Feeling extra tired? This virus could be the culprit, study ...

    www.aol.com/feeling-extra-tired-virus-could...

    A new study found that people who have had COVID-19 are more likely to develop chronic fatigue syndrome. A researcher and doctor weigh in on the symptoms to watch for.

  7. Starvation response - Wikipedia

    en.wikipedia.org/wiki/Starvation_response

    Starvation response in animals (including humans) is a set of adaptive biochemical and physiological changes, triggered by lack of food or extreme weight loss, in which the body seeks to conserve energy by reducing metabolic rate and/or non-resting energy expenditure to prolong survival and preserve body fat and lean mass.

  8. Muscle fatigue - Wikipedia

    en.wikipedia.org/wiki/Muscle_fatigue

    Substrate shortage is one of the causes of metabolic fatigue. Substrates are depleted during exercise or are unable to be metabolized (e.g. metabolic myopathies), resulting in a lack of intracellular energy sources to fuel contractions. In essence, the muscle stops contracting because it lacks the energy to do so.

  9. Starvation - Wikipedia

    en.wikipedia.org/wiki/Starvation

    Starvation is a severe deficiency in caloric energy intake, below the level needed to maintain an organism's life. It is the most extreme form of malnutrition.In humans, prolonged starvation can cause permanent organ damage [1] and eventually, death.

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