He is 82, with Alzheimer's Disease...I have to feed him most of the time. I just bought a Ninja blender to prepare pureed foods. This is all new to me and do not know how to prepare the foods. I have been giving him sweet potatoes, scrambled eggs, mashed vegetables, pasta, etc. How much does a manhis age need to eat to remain healthy?He does notlike to drink water and his skin is very dry. I worry about dehydration. Any advice would be greatly appreciated. A year ago he was 25 lbs heavier. His current weight is just a little underweight and don't want him to lose any more.