Popular foods Americans eat every day linked to silent brain damage, alarming study finds
A Canadian study found that healthy adults who ate more ultra-processed food were more likely to show small areas of brain damage on MRI scans. The changes may cause no obvious symptoms but could be early signs associated with later stroke or memory problems, making the findings relevant to brain health before symptoms appear.
The study included about 9,000 people aged 35 to 69, and those with the highest intake were 40% more likely to show the changes than those with the lowest intake. The association was stronger among women: those in the highest intake group were nearly twice as likely to show signs of damage as those in the lowest. The study was observational, with participants assessed once, so it cannot show that ultra-processed food caused the brain changes; US data cited in the article say such foods made up 55% of daily calories for people aged one and over in 2021–23.
- Higher ultra-processed food intake was linked to MRI signs of brain damage.
- The association was stronger among women.
- The study cannot establish that diet caused the changes.
Both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The findings support taking high ultra-processed food intake seriously as a possible early risk marker for brain health. The association in a large group of adults, particularly among women, gives researchers and health professionals reason to study whether reducing these foods could help prevent later stroke or memory problems.
The case against
The study cannot establish that ultra-processed foods caused the MRI changes: it observed participants at one point, and other factors could explain the association. The changes may not lead to symptoms, and the reported percentages do not show an individual’s absolute risk, so the findings alone do not justify treating everyday consumption as evidence of brain damage.