Hormonal
Intentional weight loss in individuals with high adipose tissue stores of persistent organic pollutants (POPs) may lead to long-term cognitive decline due to the mobilization of these neurotoxic chemicals into the circulation and brain.
If you are overweight and have high exposure to environmental toxins (like certain pesticides or industrial chemicals), be aware that rapid or intensive weight loss might temporarily increase the levels of these chemicals in your blood. While weight loss is generally good for heart and metabolic health, this specific mechanism suggests that slow, steady weight loss might be preferable to minimize the spike in circulating toxins, especially if you have existing cardiovascular issues. Focus on reducing external exposure to POPs (dietary sources) alongside weight loss.
As POPs in the blood can easily reach the brain, the intentional weight-loss group of the Look AHEAD study may have experienced an unappreciated and long-term disadvantage on their cognition.
Why this rating
The paper is a theoretical hypothesis proposing a mechanism to explain existing observational data; it does not present new primary experimental evidence for the cognitive effects of POP release.
Source
Intensive weight loss and cognition: The dynamics of persistent organic pollutants in adipose tissue can explain the unexpected results from the Action for Health in Diabetes (Look AHEAD) study
Yu‐Mi Lee et al. · Alzheimer s & Dementia · 2020
DOI 10.1002/alz.12065
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