How Food Choices Shape Memory, Cognition & Cravings | Dr. Scott Kanoski
Scott Kanoski, a USC professor studying nutrition and the brain, explores how food choices shape memory, cognition, and cravings. Topics include GLP-1 drugs and appetite, artificial sweeteners, the gut-brain connection, the hippocampus, processed diets and dementia risk, exercise, microbiome health, and how repeated eating patterns can reshape food preferences.
Top snips
GLP-1: More Than a Weight-Loss Drug
3:29 – 5:45
GLP-1 is naturally released around meals and helps regulate blood glucose, insulin, and appetite.
Drugs such as Ozempic and Wegovy create super-physiological levels, suppressing hunger through signals involving the gut, vagus nerve, brainstem, and possibly the brain itself.
Potential applications for reward circuits, memory, and dementia remain preclinical and unproven in humans.
Artificial Sweeteners: The Evidence Is Mixed
20:17 – 21:27
Sweet taste normally predicts incoming calories, triggering a small cephalic-phase insulin response.
Animal studies suggest that separating sweetness from calories may disrupt appetite and glucose regulation. But human trials remain inconsistent: artificial sweeteners may help when replacing sugary drinks, yet habitual exposure could alter appetite.
There is no definitive verdict yet.
Your Food Memory Helps Control Your Next Meal
27:06 – 29:08
Memory is part of appetite regulation—not just a record of what happened.
People reminded of a recent pizza lunch ate fewer cookies later. In another experiment, people’s later hunger depended more on how much soup they thought they consumed than how much they actually consumed.
Remembering a meal can support satiety and restraint.
The Western Diet Can Impair Memory
34:14 – 36:42
In rodent studies, diets high in simple sugars and saturated fat impair hippocampus-dependent memory—even after animals return to healthy food.
Early-life sugar or junk-food exposure produced deficits that persisted into adulthood. Some effects may involve the gut microbiome, suggesting that diet can influence memory through both metabolic and gut-brain pathways.
The Gut Talks to the Hippocampus
51:16 – 54:13
The vagus nerve carries information from the gut to the brain, eventually influencing the hippocampus through the brainstem, medial septum, and acetylcholine.
During eating, hippocampal acetylcholine rises in pulses—and remains elevated after the meal. This may help animals remember what they ate, where they found it, and whether to return.
Cravings Can Be Rewired
1:44:22 – 1:46:58
Dopamine is less about simple pleasure than wanting, motivation, and reinforcement.
Highly palatable foods strongly activate reward circuits, but those circuits are plastic. People who reduce sugar may find formerly appealing foods too sweet, while healthier foods can become more rewarding over time.
Your repeated choices help shape what your brain craves.