Dementia and not eating: why it happens, and what to do about it

By Lee-Ann Clark · 8 years in dementia and Alzheimer's care

If you've found this page because your mum or dad isn't eating the way they used to, take a breath. You're in the right place, and what you're seeing has an explanation.

I've spent eight years in dementia care — in people's homes, in hospitals, sitting at kitchen tables with worried families. And of all the early signs that someone needs more support, this is the one that gets missed more often than any other. Not because families aren't paying attention, but because it rarely looks the way you'd expect.

What eating problems actually look like in dementia

Most people picture someone refusing meals or pushing a plate away. Sometimes it is that. But far more often, it's quieter:

• Forgetting they've already eaten — and eating again. The biscuit tin empties faster than it should, but proper meals get skipped.
• Eating the same thing every single day — the same cheese sandwich, the same cereal — because deciding on anything else feels too big.
• Losing interest in food they've always loved. The Sunday roast goes half-eaten. The favourite pudding sits untouched.
• Meals shrinking without anyone noticing — a bit less each week, until the clothes start hanging differently.

If you've spotted any of these, you're not imagining things. And your parent isn't being difficult or fussy.

Why does dementia affect eating?

Dementia affects the parts of the brain that regulate hunger and taste — so someone can genuinely not feel hungry, or find that food doesn't taste the way it used to. It also affects the ability to plan and carry out tasks. Making a meal isn't one job; it's a chain of small decisions — what to have, what's in the fridge, which pan, what order. When that chain becomes too much to hold together, people quietly stop cooking and reach for whatever's easiest. Or nothing at all.

That's the important bit. This isn't just about food. It's information — a signal that the level of support around them needs to change, ideally before anything reaches a crisis.

What to do tonight: start a food diary

Here's the single most useful thing you can do, and you can start it today. Keep a simple food diary — nothing fancy, just a note on your phone of what they actually eat each day. Not what was offered. What went in.

Do it for two weeks. What you're looking for is the pattern: meals skipped, portions shrinking, the same food on repeat, weight visibly dropping.

When to speak to the GP — and the exact words to use

If two weeks of notes show a significant change, book a GP appointment and bring the diary with you. Then ask specifically for a nutritional assessment.

Those two words matter. "I'm a bit worried about Mum's eating" is easy for a busy surgery to reassure away. "I've kept a two-week food diary and I'd like a nutritional assessment" is something the system can act on. You have every right to ask, and the diary in your hand turns your gut feeling into evidence.

A few things that help in the meantime

While you're keeping the diary, some small changes that make eating easier for someone with dementia:

• Offer one choice, not five. "Would you like the soup?" lands better than "What do you fancy?"
• Eat together when you can. People with dementia often eat more when someone eats with them — it's a cue the brain still recognises.
• Keep finger foods within reach — sandwiches cut small, fruit, cheese cubes. Food that doesn't need a knife and fork often gets eaten when a plated meal doesn't.
• Don't argue about the second breakfast. If they've forgotten they ate, telling them so rarely helps. A smaller portion the second time round does.

The bigger picture: this is usually not the only sign

In my experience, eating changes rarely arrive alone. They tend to show up alongside other quiet shifts — in the home, in hygiene, in how sociable someone is — that together tell you it's time to think about more support. The families I've seen navigate this best are the ones who knew what to look for early, while there were still plenty of choices on the table.