dear user thanks for contact HCM brief answer it is due to maldigestion and unhealthy food habits detailed answer unhealthy food style is the main cause but we should take in concern your hyperglycemia..some times amoebic infection causes intestinal distension and bloating that can be managed by metronidazole tablets ..you should have vegetables and fruits and salad and fiber diet and avoid heavy meals and spicy food that will help to avoid cause of that bloating you have ..also irregular meals time is amain cause and you should have about 5 small meals regular time to avoid that ..and please you should monitor your blood glucose with adoctor hope that helps