Does Neuroinflammation Underlie the Cognitive Changes Observed With Dietary Interventions?

Area of Science:

• Neuroscience
• Nutritional Psychiatry
• Gerontology

Background:

• Dietary interventions, including calorie restriction and ketogenic diets, are popular in aging research and linked to cognitive health.
• Epidemiological studies suggest benefits for mental health, mood disorders, and dementia.
• However, randomized controlled trials have not yet confirmed clinical efficacy in neuropsychiatric disorders.

Purpose of the Study:

• To review the evidence base for ketogenic and calorie restriction diets in neuropsychiatric conditions.
• To examine the quality of existing studies, from preclinical to clinical trials.
• To discuss the underlying cellular mechanisms and suggest improvements for future research.

Main Methods:

• Systematic review of preclinical experiments, case reports, small clinical studies, and randomized controlled trials.
• Analysis of studies investigating neuroinflammation, neuroprotection, and neuromodulation.
• Evaluation of the efficacy, limitations, and side effects in specific patient populations.

Main Results:

• While popular, randomized controlled trials show limited clinically convincing effects for calorie restriction and ketogenic diets in neuropsychiatric disorders.
• Preclinical and smaller studies suggest potential benefits mediated by neuroinflammation, neuroprotection, and neuromodulation.
• The quality of evidence varies significantly across studies and conditions.

Conclusions:

• Current clinical evidence for ketogenic and calorie restriction diets in neuropsychiatry is not robust.
• Understanding cellular mechanisms is crucial for future research.
• Improved study designs are needed for better clinical translation and patient application.