My husband does not like some foods that he used to love. He doesn't complain about the temperature. Sometimes he takes so long to eat that it gets cold but he says no when I ask him if he would like me to heat it up. I suspect that the sensory experience of tasting and sensing hot and cold in foods is part of the overall brain failure of dementia. At this stage I cannot ask him what he would like to eat because he can no longer process the question so he always says he's not hungry. I have learned to just put him in his chair in the kitchen and put whatever I have cooked in front of him. At this point in his dementia he needs visual clues. The plate with food on it is his clue that it's time to eat. I also struggle to control his blood sugar because to be most effective the insulin must be given 20 minutes before eating. If I do it then and he doesn't eat his meal he will get hypoglycemic. So I wait until I see that he is eating and will likely finish. This is not ideal but blood sugar a little high is better than blood sugar too low. I think all we can do is just try to adjust to what is on a day to day basis.