Study Reveals Unexpected Kitchen Chore Linked to Higher Dementia Risk
Scientists Warn: Dishwashing Plastic Releases Harmful Microplastics Linked to Dementia, Cancer, and More
Placing plastic items like plates, bowls, cups, and cutlery in the dishwasher may raise the risk of dementia, scientists warn. Research reveals that mechanical dishwashing releases toxic microplastics—particles small enough to breach the blood-brain barrier—that contaminate nearby utensils and pose health risks.
Mechanical dishwashing releases micro- and nano-sized plastic particles (Image: Daily Mail)
Toxic Risk in Dishwashers
A single dishwasher cycle can release nearly a million microplastic particles, equivalent to approximately six milligrams of plastic accumulating in the human body annually—about a quarter of a grain of rice. The heat and abrasive cleaning processes (with temperatures up to 158°F, detergents, and rinse cycles) drive this release.
Microplastics & Health Threats
Microplastics (less than 5mm) and even smaller nanoplastics (under 100nm) are linked to dementia, cancer, cardiovascular disease, and fertility issues. Recent studies found dementia patients’ brains contained up to 10 times more microplastics than those without cognitive decline.
Microplastics infiltrate human tissues and are linked to severe health risks (Image: Daily Mail)
Implications for Dementia
In 2025, an estimated 7.2 million Americans aged 65+ live with Alzheimer’s dementia, a number projected to rise to nearly 12 million by 2040. While no definitive link exists yet, brain samples from dementia patients showed alarmingly high microplastic concentrations.
Environmental Impact Beyond the Kitchen
Released microplastics not only contaminate dishes but also enter wastewater, polluting ecosystems. Dr. Elvis Okoffo (University of Queensland) emphasized, “Even routine activities like dishwashing have environmental consequences.” However, he noted the mass released is minor compared to other pollution sources.
Alzheimer’s cases are projected to surge in the U.S. by 2040 (Image: Daily Mail)
Brain Invasion: A Growing Concern
A 2025 University of São Paulo study found microplastics in eight out of 14 deceased individuals’ brains, particularly in the olfactory bulb (linked to smell processing). This suggests inhalation or ingestion as entry routes. Lead researcher Prof. Thais Mauad warned nanoplastics may invade cells more easily, potentially altering bodily functions.
Key Takeaways
- Avoid dishwashing plastics; opt for glass, stainless steel, or ceramics.
- Microplastics pollution extends beyond oceans—household habits contribute.
- Further research is critical to confirm long-term health impacts.
While more studies are needed, reducing plastic use in daily routines could mitigate risks to human health and the environment.
