My elderly father has taste changes,nausea, aversion to food and its smell. He is having increased joint pain in his knees as well. He is on 1,0000 unit Vit D, fish oil, a multivit/mineral and gets sunlight. He is on lisinopril and methocarbamol. I am wondering if medicines are his problem. He has been a great eater and now doesn t like the smell of food.