It is not uncommon for people with Alzheimer’s to experience a change in appetite. There are many reasons why this might happen, including depression and difficulty with the mechanics of eating. It could be critical to take your loved one to the doctor for an assessment. At the same time, the Alzheimer’s Association is an excellent source of information at alz.org. They can also refer you to resources near to where you live. You will also find another helpful article by the UK Alzheimer’s Association on eating and drinking at http://alzheimers.org.uk/site/scripts/documents_info.php?documentID=149.