Common Food Preservatives Linked to Cognitive Decline
NonToxCo Research
Science & Safety Team · 4/7/2026
Two preservatives in your processed food, TBHQ and BHT, are linked to a dramatically higher risk of cognitive impairment as you age.
Preservatives That Wreck Your Brain
A 2026 study in Environ Pollut measured ten environmental phenols in the urine of 122 adults aged 45 and older, then tested their cognitive function. The results were striking.
People with the highest levels of TBHQ (tert-butylhydroquinone) had an odds ratio of 16.70 for cognitive impairment compared to those with the lowest levels. BHT (butylated hydroxytoluene) and DHDPE also drove the risk up.
The Mixture Is Worse
When all phenols were analyzed together, the mixture showed an odds ratio of 3.62 for cognitive impairment. Three chemicals (TBHQ, DHDPE, and BHT) accounted for 83% of the total risk.
BHT showed a monotonic risk pattern: the more you're exposed, the worse your cognition gets. There's no safe plateau.
Where These Chemicals Hide
TBHQ and BHT are synthetic antioxidants added to processed foods, cooking oils, cereals, and snack foods to extend shelf life. They're in thousands of products you buy at the grocery store.
How to Protect Your Brain
Read ingredient labels. Avoid products listing TBHQ or BHT. Choose fresh, minimally processed foods. Cook with simple oils that don't need chemical stabilizers. And check out non-toxic home essentials for cleaner options throughout your daily routine.
Also see non-toxic kitchen essentials for safer alternatives.