How are Insulin and fatigue related?

Insulin and fatigue are linked through blood glucose regulation. In insulin resistance—a precursor to type 2 diabetes—cells fail to take up glucose efficiently, leading to low cellular energy and persistent tiredness. Additionally, large blood sugar swings (both hypoglycemia and hyperglycemia) can cause fatigue. However, fatigue is multifactorial: sleep quality, stress, thyroid function, and nutrient deficiencies are equally important. A DNA test for insulin-resistance variants (e.g., TCF7L2) offers only a small piece of the puzzle, not a diagnosis. Practical steps: check fasting glucose, HbA1c, and consider a glucose tolerance test. Caution: Do not self-treat without medical evaluation.