My husband (71) was prescribed a proton pump inhibitor along with his chronic drugs. Is this really necessary?

His digestion is excellent and his appetite is small. He only wants to eat twice a day - a late breakfast and a fairly early dinner. He is diabetic but no longer on insulin - just Glucophage and his blood sugar is under control. The medication sheet said the proton pump inhibitor is "to prevent ulcers". Should this be treated as a chronic medication? He has never had an ulcer or even indigestion.