# Neurobiochemical Effects of a High-Fat Diet: Implications for the Pathogenesis of Neurodegenerative Diseases

## TL;DR

This paper reviews how high-fat diets, including ketogenic diets, may harm brain health and contribute to neurodegenerative diseases, while also highlighting potential protective effects in some cases.

## Contribution

The paper systematically reviews the neurobiochemical effects of high-fat diets and their dual role in both harming and potentially protecting brain health.

## Key findings

- High-fat diets are linked to oxidative stress, neuroinflammation, and cognitive decline in brain regions like the hippocampus.
- Ketogenic diets may offer neuroprotective benefits in Parkinson’s and Alzheimer’s disease models, though long-term safety is uncertain.
- The effects of high-fat diets depend on factors like fat type, duration, and individual characteristics such as age and sex.

## Abstract

This article discusses how a high-fat diet affects brain function and the development of neurodegenerative diseases. The goal was to summarize current knowledge on how excessive fat consumption—especially in the form of ketogenic diets—impacts brain metabolism, inflammation, and cognitive function. The authors show that such diets can cause oxidative stress, memory decline, and disruptions in key brain areas like the hippocampus, hypothalamus, and dopamine system, and even affect brain development in offspring. However, ketogenic diets may offer protective effects in some cases, particularly in Parkinson’s, Alzheimer’s, or ALS, although their long-term safety is still uncertain. Most studies cited are based on animal models, which limits their direct applicability to humans. The authors conclude that caution is needed with high-fat diets and that further research is essential to distinguish between harmful and potentially beneficial fats and dietary patterns. This topic has significant societal value, especially given the popularity of weight-loss diets.

The global rise in high-fat diet (HFD) consumption and obesity has raised concerns about their long-term effects on brain health. This review addresses how HFDs, including ketogenic diets (KDs), influence the central nervous system (CNS) and may contribute to neurodegenerative processes. The findings show that prolonged HFD exposure is associated with altered brain metabolism, increased oxidative stress, neuroinflammation, and impaired synaptic plasticity, particularly in regions like the hippocampus and hypothalamus. These changes may affect cognitive function and accelerate neurodegenerative mechanisms linked to disorders such as Alzheimer’s and Parkinson’s disease. While certain types of KD appear to exert neuroprotective effects—such as improved motor outcomes in experimental Parkinson’s disease models—evidence remains inconsistent, and concerns about their long-term safety persist. This review emphasizes that the impact of high-fat nutrition on the CNS depends on fat type, exposure duration, and individual factors such as age and sex. Overall, further research is needed to distinguish between harmful and potentially therapeutic dietary fat patterns and to better understand their influence on brain health across the lifespan.