The average human brain could contain a spoonful of microplastics. 

A new study published Monday in the journal Nature Medicine found that there was about seven grams in the average brain, about as much as you'd find in a plastic disposable spoon. 

The amount of plastic in brains increased dramatically between 2016 and 2024.  Livers and kidneys also showed increases, but the concentrations in brains was 30 times greater. 

People with dementia had the highest levels.  The health implications of microplastics in the brain are as of yet unclear.