Hi Thanks for posting your query on HCM I have read and understood your concern Your symptoms may be related. Poor food taste may cause loss of appetite and automatically extreme tiredness and lightheadedness.The exact cause of your symptoms may only be know after medical examination and some laboratory tests.Possible causes may include: -Stress -Metabolic disorders(like vitamin and ions deficiency) -Infections I will advise you try the following: *Take some multivitamins/anti-asthenic drugs *Rest well *Manage stress if the case If symptoms persist, you see the Doctor for examination and investigations. Hope this will help.You may write back if more concerns Wish you good health Dr Mbuomboh