Looking at your results together, the most likely contributors to your persistent fatigue and low energy are: (1)
Vitamin D insufficiency at 28.81 ng/mL â levels below 30 are well-known to cause fatigue, muscle tiredness, and low mood; (2)
Vitamin B12 at 273 pg/mL â while technically within range, this low-normal level can cause functional deficiency with reduced stamina and drive, especially in a young male; and most importantly (3)
HbA1c of 5.8%, which places you in the prediabetes range â insulin resistance at this stage directly reduces cellular energy efficiency and commonly presents as persistent fatigue, brain fog, and libido reduction. Your post-meal palpitations are likely reactive hypoglycemia â a blood
sugar dip 1-2 hours after eating that is very typical of early prediabetes. Your
testosterone at 488 ng/dL is normal, so that is not the primary cause. The slightly elevated globulin should be monitored but is not urgent. The good news is that with the right steps, prediabetes is completely reversible at your age.
Next Steps
Start
Vitamin D 60,000 IU weekly for 8 weeks then 2000 IU/day maintenance, and Methylcobalamin 1500 mcg daily for 3 months. For prediabetes: strictly reduce refined carbohydrates and sugars, exercise 30 minutes daily â this is reversible with lifestyle. Get fasting insulin and HOMA-IR to assess insulin resistance, and a 2-hour post-meal glucose to confirm reactive hypoglycemia. Also get a serum protein electrophoresis (SPEP) for the elevated globulin. Please consult me directly on Practo for a detailed evaluation.