was essen für mehr energie — which blood markers matter?

To boost energy, both diet and specific blood markers matter. Key markers include: ferritin (iron stores), vitamin D, vitamin B12, TSH (thyroid function), fasting glucose, HbA1c (long-term glucose), and morning cortisol. Deficiencies in iron, B12, or vitamin D can cause fatigue, as can hypothyroidism or blood sugar dysregulation. Diet should be tailored to these markers: for low ferritin, consume iron-rich foods like red meat, legumes, and whole grains with vitamin C. For B12 deficiency, animal products or supplements are needed. Vitamin D comes from sun or supplements. Crucially, DNA tests indicate predisposition but not current levels; only a blood test gives accurate status. Consult a doctor before supplementing. Evidence is based on standard medical practice, not a single study.