New research indicates a 50% increase in microplastics found in human brains over the past eight years, with higher concentrations in dementia patients. The study, published in Nature Medicine, analyzed brain samples and found microplastics are prevalent due to increasing plastic waste. The lead researcher states this accumulation poses potential health risks, yet further investigation is needed to understand the full implications. Microplastics can cross the blood-brain barrier, and sources include polluted food and air. Despite efforts to curb plastic usage, microplastics remain a growing concern.