My wife has Alzheimer's and Vascular Dementia and has been on Galantamine since dignosis 7yrs ago. Until early last year her weight increased to a size 18 despite efforts to stabilise or reduce it and then for some reason she started to lose interest in her food. As a result she is now size 14, more like her normal size. It was extremely difficult to get her to eat despite my best efforts as her carer and OH. A visit to the GP resulted in blood tests which didn't show anything that might cause this loss of appetite and weight; a visit to a dietrician was suggested. About the same time we saw our mental health doctor who suggested Metazapine, partly because of other changes in attitude but also because a side effect of this drug can be stimulus of the appetite. Whilst only on Metazapine for 4wks her appetite improved greatly, as well as her attitude and demeanor. For other reasons my wife was taken off the Metazapine but her appetite for food continues today. Was it the effect of this drug or just coincidental with the variable nature of the desease? I don't know. At no time did the loss of appetite or weight loss appear to cause any other problems e.g strength, energy, mobility - this is the overriding consideration. Also, due to lack of exercise, stimulus, etc., and the desease itself, it can reflect in loss of appetite as the body does not require the same amount of energy building foods, so we were told. The dietician recommended ensuring that what food and drink was taken was of high protein e.g. use full cream milk, add some of the high protein powder/liquid products available to cereals, drinks, other food. Tinned creamed soups, thick creamy yogurts, custard, ice cream, milkshakes, and many other foods were identified. It was also said that placing the food on a single bright colour mat or plate can often aid focus and interest in the food.
A visit to your GP and possibly a dietrician should help identify the cause and solution and help put your mind at ease. Hopefully our experience above helps a little, also. Our best wishes in finding a solution.