My mother has dementia and she will not stop eating. Is it possible her brain doesn’t remember that she just ate?

Eventually they will stop eating or lose all interest in food and you will have the opposite problem.

My mom has same issue. She forgot she ate and eats again. Her chosen food is cookies, so she has gained a lot of weight. Her doctor said it's okay cos there will come a day she'll forget to eat or won't want to. So we buy heathier fiber rich protien cookies like Benvita. Also, they mistake thirst for hunger, so try to get her to drink more water.

She might be forgetting that she already ate or she might really have an increased appetite due to medication. Sometimes, people who have dementia have obsessions. My LO had obsessions with her cat and certain things in her house, like air fresheners. She couldn't get enough of either. She was also very anxious. Medication helped her with both and made her feel much better. I might discuss it with her doctor to see what he days. I'd be inclined to let her eat whatever she enjoys, unless it's making her sick. I'd also hate to see her gain a bunch of weight, because, it's more difficult to assist an obese person with their personal care, if they are very overweight.

my MIL had a very set routine throughout her life. Had to with 6 boys. Anyhow, she would eat breakfast and then want to start lunch. As a stay at home mom with six boys, a husband and no dishwasher, it made sense. Get done with one meal start the next.
Any how, we got her a white board and magnets. After she ate she would put a magnet in to the done space. The there was a choice of activities (write to someone, have the dog take her for a walk (a VERY WELL trained St. Bernard) around the (fenced) yard, paint, etc. Then, when the alarm sounded, it was time for lunch. Repeat for the afternoon.
Mind you, this only worked for about a year.

Not a surprise. My father eats a large meal and 20 minutes later he forgets. It's part of the illness. Apples and nuts may be helpful.

How I wish my husband would eat like that because he hardly eats at all now. He went from 140 pounds down to 94 in 5 months. Had him checked at his medical appointment but they don't know why he won't eat. He always says he is full after eating a quarter of his meals. I bought him Ensure and he drinks about 2 sips. He seems to have lost interest in food.

My mother will eat a big meal and 20-30 min later say she did not eat and was still hungry. I have a hard time getting her to drink water as well. Earlier this year I had to buy the locks for the fridge because I would wake up the next day and she had raided the kitchen, left dirty dishes and half sandwiches all over the house. I leave out healthy things like fruit and nuts in case she wants to binge on something. She hates that I lock the fridge but it's for her safety and my pockets! Hope this helps.

I am sorry Folks but putting locks on the Fridge door is a thing that I would never do to any One and most certainly not to some one I love and Who is dying.
Unfortunately the Brain is sick and as time passes the illness will progress and Your Love One will not desire food, and will not be able to eat. In the End allowing Your Dearest to eat and even binge won't make much difference but They will have felt much happier. My advice is "DO NOT FIGHT IT" but go with it. All You will be left with are memories so let those be beautiful memories. As for crumbs and bits of bread here and there ? Who cares, easy to deal with.

Absolutely!

There is someone in my office that eats at least every hour. She does not have dementia. Some people just eat more than others.

I would keep mostly healthy food in fridge...be thankful she can walk & take for herself.