LDL cholesterol itself does not directly cause fatigue. However, elevated LDL is a risk factor for atherosclerosis, which can eventually lead to cardiovascular diseases (e.g., heart failure) that may cause fatigue. Fatigue has many other common causes: poor sleep, stress, iron deficiency, hypothyroidism, or high triglycerides/low HDL. A DNA test for LDL-related genes (e.g., APOE, PCSK9) indicates only genetic predisposition, not current levels. To investigate fatigue, check a complete lipid panel, thyroid function, blood count, and inflammatory markers (CRP) with your doctor. Evidence: the LDL-fatigue link is indirect and moderately supported by human studies. Safety note: persistent fatigue requires medical evaluation.
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