The Summary
In a 12-week randomized controlled trial, researchers investigated if adding potato fiber and sugar beet pectin to a high-protein, 45% plant-based diet improved brain function and food cravings in adults with overweight and prediabetes. Participants took either the fiber supplement or a placebo. Using fMRIs and cognitive tests, they found that while the extra fiber did not alter brain activity in response to food cues, the overall diet led to significant cognitive improvements, including faster psychomotor speed and better visual memory, alongside reduced subjective hunger across both groups.
Why this is interesting
While we often isolate specific "superfoods" like fiber for brain health, this study highlights that the broader dietary pattern matters most. We used to believe targeted fiber supplements were necessary to trigger gut-brain axis benefits for satiety and cognition. Instead, simply adopting a high-protein, partially plant-based diet for 12 weeks was powerful enough on its own to enhance memory, speed up thinking, and naturally lower hunger levels. For readers, this means focusing on whole-food, protein-rich plant diets offers immediate cognitive and appetite-control benefits.