No sensation of hunger

Patient: I would like to know why l never experience the sensation of hunger. I am a overweight and l am 59yrs old. I have been on many diets and lost weight but l am eating to a time schedule rather than eating when l feel hungry. Yesterday l ate 40g of readybrek with skimmed milk ast 9am, l decided not to eat until l felt hungry, at 5pm l still had no signs of hunger is this normal. L am on losec, 50mg nortriptylene at night and 50mg of delofenic a day can you give me an explanation please. I have athritis I dont smoke