Silent strokes and white-matter damage 1.4X more likely with the most ultra-processed food
Ultraprocessed Food Intake and Adiposity, Vascular Brain Injury, and Cognition in Middle-Aged Adults
JAMA Network Open, October 15, 2026, https://doi.org/10.1001/jamanetworkopen.2026.39118
Russell J. de Souza, Karleen M. Schulze, Dipika Desai, Jean-Pierre Després, Trevor J. B. Dummer, Matthias G. Friedrich, Jason Hicks, Vikki Ho, Scott A. Lear, Douglas S. Lee, Andrew Mente, Victoria Miller, Paul Poirier, Eric E. Smith, Jean-Claude Tardif, Koon K. Teo, Jennifer E. Vena, Salim Yusuf, Sonia S. Anand
Summary by Claude Opus 5.5 - October 2026
Takeaway: Middle-aged Canadians who ate the most ultra-processed food (UPF) had more total body fat and more belly (visceral) fat. They were also 40% more likely to show silent vascular brain injury on MRI. This means small "covert" strokes or heavy white-matter damage, which cause no symptoms but are linked to later stroke and cognitive decline. Their scores on two brief cognitive tests were not lower. The authors call these changes that "may precede detectable cognitive deficits."
Study: This was a cross-sectional analysis (one visit) of 8,783 adults aged 35–69 without heart disease, drawn from two Canadian cohorts (CAHHM and PURE-MIND) and recruited 2010–2018. Diet came from a single food-frequency questionnaire, classified with the NOVA system. On average, UPF supplied 42% of calories. Neurologists who did not know participants' diets read the brain MRIs. The paper is peer-reviewed.
Highest vs lowest quarter of UPF intake (fully adjusted):
- Body fat: 1.7 percentage points higher
- Visceral fat: 5.7 mL more; liver fat: no difference
- Silent vascular brain injury: 11.3% vs 8.1% (OR 1.40, 95% CI 1.10–1.77)
- MoCA and Digit Symbol test scores: no difference
- Exploratory: the brain-injury link appeared in women (OR 1.78) but not in men (OR 1.08)
Adjusting for body fat and visceral fat did not weaken the brain link, so weight gain alone may not explain it.
Vitamin D was not measured.
What this does NOT show
- Cause and effect: diet, fat and MRI were all measured at the same visit
- A firm brain result: the link lost significance when UPF was counted as % of calories or % of food servings
- That other factors were ruled out: the top-UPF eaters had less education and income, smoked more, exercised less, and were 94% White European vs 70% in the lowest quarter
- That brains are unaffected: short tests in a highly educated group may miss early change
- Anything about vitamin D, which was not measured
Related in VitaminDWiki
- Ultra-processed foods associated with worse health and lower Vitamin D - many studies
- Obesity is 50% more likely if eat ultra-processed foods - Vitamin D can help
- If you eat ultra-processed foods, you need Vitamin D
- 3 lbs weight gain in just 3 weeks from Ultra-processed foods - RCT Oct 2025
Brain
- White Matter Hyperintensities (brain) 1.8X more likely if 10 ng less vitamin D - meta-analysis
- Brains of seniors had 60 percent more white matter abnormalities if low vitamin D
- Fewer white spots in MRI brain scans if had more vitamin D
- Inflammation of small blood vessels in the brain is associated with low vitamin D