I have low digestion power and usually feel less energetic. i usually cover 5-6 km daily walking/running. what can be done to improve digestion/energy?

? thyroid gland: dysfunction, can be the cause for your symptoms, kindly see your doctor for evaluation, it might be depression as well, however you do have a drive and physically active. As for the digestion, I am not sure exactly what you meant by 'low digestion power' , probably you meant indigestion, at any rate, your doctor would assess your symptoms better, best wishes