The plate-color trick is to serve meals on bright-red or bright-blue dishes instead of white ones. The strong color contrast helps a person with advanced Alzheimer's see food and drink more clearly. Contrast sensitivity is the ability to tell an object apart from its background. In advanced Alzheimer's it often fades, so light food can disappear against a white plate.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- Why does food disappear on the plate?
- What did the early studies find?
- How strong is the evidence?
- How can you try high contrast at home?
Why does food disappear on the plate?
Researchers link the problem to reduced contrast sensitivity, depth perception and object-background discrimination in advanced Alzheimer's. Food becomes hard to separate from a white plate, and milk becomes hard to see in a white cup.
That visual confusion can reduce interest in eating even when appetite remains. Increasing the difference between food, dish and table helps the meal stand out.
What did the early studies find?
Boston University researchers studied nine men with advanced Alzheimer's using bright-red plates, cups and cutlery. Food intake rose 24.6% and liquid intake rose 83.7% compared with white tableware, according to ScienceBlog's 2004 report in ScienceBlog's 2004 report.
The same team also tested bright blue, which raised food intake 25.1% and liquid intake 29.8%. Pastel red and blue had little or no benefit. The peer-reviewed report was Tracey Dunne and colleagues on visual contrast in Clinical Nutrition in August 2004.
How strong is the evidence?
The landmark finding was very small, with only nine older men with severe Alzheimer's. A 2020 Canadian crossover trial of 18 residents found no significant overall food-intake difference between blue and white dishware, as described in the BMC Research Notes trial summary.
In that later trial, only five of 18 residents increased average intake by 10% or more with blue dishware. Eating-challenge rates also did not differ significantly between colors.
How can you try high contrast at home?
Use a white plate on a dark-green tablecloth or navy tray liner with good lighting. Use a dark plate for light foods such as rice, potatoes or chicken, as recommended in Brookdale dementia-care guidance.
Alzheimer's Los Angeles gives similar caregiver advice. Start with one bright-red or bright-blue place setting and watch whether meals get easier.
- Choose a plate color that differs from both the food and the table
- Avoid white food on a white plate
- Keep lighting bright and glare-free
- Keep the table pattern simple so food is the focus
