My father has vascular dementia.
He is mostly pretty easy going, but he does not remember for more than a few moments what he had been doing.
He lives in his own home with my adult son and my son's girlfriend. She has a part time job, my son's only job is to be on duty all the time. Well, no one can do that, and my sister and I help out as much as we can in between full time jobs.
I will come over and take him out for coffee and a donut and on the way home he will suggest that we "...go somewhere for a cup of coffee"
My father eats anything and everything that he can get his hands on.
He will get up in the middle of the night and eat.
He does not understand about cooking any more, so all the raw meat is in the garage freezer.
We tried putting 'single serving sizes' of all sorts of things in the fridge. There was plenty to eat, and it included a variety of foods. That idea worked OK for about a year.
It reached a point where we had to put a lock on the fridge. He would drink the better part of a gallon of milk in one day, eat all the snacks that had been prepared and keep going back for more.
The most recent example: He had eaten a large breakfast and when my son took his girlfriend to work (less than an hour later) he ate all the crackers in the cupboard. There were 3 boxes, not all full, but it was still a lot of crackers.
He does not understand what is food and what is not. He tried to drink the bottle of bubbles we had for a relative's child's birthday. That surprised me, and I alerted the family to watch out for similar things.
At a recent family get together my sister served nutritious appetizers and my father kept eating, and eating, and eating... even when we told him, "Dinner will be ready in 10 minutes, and T_____ has prepared some really good food" he kept eating and eating... Then he ate a lot for dinner on top of all the appetizers.
He wants to stop at all the stands at the farmer's market or in Costco to get the free samples. We can laugh at that, and simply insist that he wait his turn and use the tongs.
But the situation is getting worse at home. He recently pried the lock off the fridge to get to the food.
He has 3 meals a day plus snacks in between, and this schedule has been posted on the fridge. When someone is there he can be reminded that he just ate, and can have a snack soon, then be redirected. But in those few minutes when no one is there (or asleep or showering...) he heads right for the kitchen. His weight is good, he does not need to gain any weight, we are fighting to keep him from gaining weight.
We are watering down the juice so that if he drinks it all (and he has done that) he is really getting perhaps a cup or two of juice and a lot of water.