Hi, Noted your history about having pure vegan taking plant based low fat and high carbohydrate foods, developing distension of abdomen on eating large meal, feeling hungry even on eating just now, regaining weight which you lost after converting to pure vegan, wants to know whether this is due to carbohydrate sensitivity, insulin resistance or leptin resistance. All these things can be diagnosed on proper clinical evaluation, appropriate investigations of the stool, blood for insulin and sugars. CT scan of abdomen may be needed to see for any intestinal obstruction which can have similar picture, cancer needs to be ruled out. Your keen watch as to which foods and beverages are causing these will help to stop/alter such things to get results if the CT scan is normal. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T. Chandrakant, General Surgeon