Research over the past 15 years has expanded scientists’ understanding of how dietary interventions may affect neurological health. One area of interest is the potential role of ketone bodies as an alternativeproblem that can occur in some neurodegenerative conditions
A review published in Translational Neurodegeneration examines evidence on ketogenic diets and their potential effects in conditions including Alzheimer’s disease, Parkinson’s disease and multiple sclerosis. While early findings are promising, the diet has not been established as a treatment that can reverse or stop the progression of these diseases
Ketones as an alternative fuel
The brain typically relies heavily on glucose for energy. A ketogenic diet, which is high in fat and very low in carbohydrates, shifts the body’s metabolism toward using fat as an energycetoacetate (AcAc), beta-hydroxybutyrate (BHB) and acetone
Researchers are studying whether these compounds can provide an alternative fuel for brain cells affected by neurodegenerative diseases. In conditions such as Alzheimer’s, Parkinson’s and Huntington’s diseases, as well as multiple sclerosis, nerve cells and neural pathways can become damaged over time. Impaired energy metabolism, oxidative stress, inflammation and the accumulation of abnormal proteins may contribute to this process
Ketone bodies may help supply energy to the brain while also influencing cellular processes involved in protecting neurons
Effects beyond energy metabolism
Research suggests that ketogenic diets may affect more than the brain’s energy supply. The diet can alter the gut microbiome, potentially reducing some inflammatory microorganisms and supporting bacteria associated with intestinal barrier function
Studies have also examined whether ketosis can stimulate autophagy, a cellular recycling process that helps break down damaged components. Additionally, ketogenic diets may affect oxidative stress and inflammation, both of which have been implicated in neurodegenerative disease
What human studies have found
Some clinical studies have reported improvements in areas such as memory, daily functioning, quality of life, fatigue or motor symptoms among people with neurological disorders who followed ketogenic or modified ketogenic diets
However, the diet can be difficult to maintain over the long term. Some people experience headaches, fatigue, nausea and dizziness when they first begin a ketogenic diet, symptoms commonly referred to as the «keto flu.»
More research is needed
The ketogenic diet is attracting growing interest as a potential complementary approach to neurological disease, and preclinical research has identified several mechanisms that could explain its effects. But important questions remain about its long-term effectiveness, safety, appropriate formulation and which patients might benefit most
