Dr. Nick Norwitz's research interests include metabolic health, brain aging, ketogenic diets, cholesterol metabolism, and the relationship between nutrition and disease.
He has published research examining how ketones may affect Alzheimer's and Parkinson's diseases. His work explores an important observation: as the brain ages and in some neurodegenerative diseases, its ability to use glucose can decline, while its ability to use ketones may remain relatively intact.
This has led to growing interest in therapeutic ketosis as a way to support brain energy and potentially improve cognitive and neurological function. Norwitz's work helps explain both the science behind this approach and the emerging evidence for its use in Alzheimer's, Parkinson's, and other neurological conditions.
The brain normally relies heavily on glucose for energy. In aging and particularly in Alzheimer’s disease, glucose metabolism in parts of the brain can become impaired.
Ketones provide an alternative fuel. They are produced naturally during fasting or carbohydrate restriction and can also be increased through MCTs or ketone supplements.
Research suggests that even when glucose utilization is impaired, the aging or Alzheimer’s brain can retain its ability to use ketones. This has led researchers to investigate whether supplying more ketones can help compensate for the brain’s energy deficit.
Dr. Norwitz has coauthored scientific work examining ketogenic therapies for neurodegenerative diseases, including Alzheimer’s.
Clinical studies using ketogenic diets, MCTs, and other methods of increasing ketones have produced encouraging results. Some studies have reported improvements in particular measures of cognition, especially in people with mild cognitive impairment or mild-to-moderate Alzheimer’s.
The research provides a scientific basis for continuing to investigate therapeutic ketosis as a way to support brain energy and cognitive function.
Dr. Norwitz has also studied ketogenic interventions in Parkinson’s disease.
In one randomized crossover study involving 14 people with Parkinson’s, Norwitz and colleagues tested a ketone ester drink against a calorie-matched control drink. Participants were able to sustain exercise 24% longer after consuming the ketone ester.
The study provides evidence that increasing ketone availability can have measurable effects on physical performance in people with Parkinson’s and supports further investigation of metabolic therapies for the disease.
An important part of Norwitz’s work is explaining complicated—and sometimes controversial—areas of nutrition and metabolic research to a general audience.
His videos examine research on brain health, ketogenic diets, metabolic disease, cholesterol, obesity, and other topics. He frequently uses published studies and his own experiments to explore scientific questions.
His emphasis on questioning assumptions while examining evidence makes his work particularly useful for people interested in emerging areas of metabolic research.
A scientific review examines how ketogenic diets and ketone-based therapies might influence brain energy metabolism and discusses their potential use in Alzheimer’s, Parkinson’s, and other neurodegenerative diseases.
A scientific review examines how nutrition and metabolic health may influence Alzheimer’s risk in people who carry ApoE4 and discusses the potential for personalized dietary strategies to reduce that risk.
Dr. Norwitz explains intriguing research suggesting that ketones may help the brain identify and clear damaged, misfolded proteins associated with neurodegenerative disease.
Dr. Norwitz explains why ketogenic diets and ketones are being studied for Parkinson’s disease and reviews the mechanisms and early human research suggesting possible benefits.
Dr. Norwitz reviews a Stanford pilot study in which a ketogenic diet produced encouraging improvements in both metabolic health and psychiatric symptoms in people with schizophrenia or bipolar disorder.
Dr. Norwitz discusses how personalized medicine, metabolic health research, continuous glucose monitoring, and emerging technologies may change the way health and disease are understood and treated.
Dr. Bikman explains how ketones, particularly beta-hydroxybutyrate (BHB), act not only as an alternative fuel but also as signaling molecules that may influence inflammation, gene expression, mitochondrial function, and cellular resilience.