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#23 The Brain-Metabolic Connection


Mental health is an area of great interest and complexity, and more and more studies have begun to explore the connection between metabolic pathways and emotional well-being. The brain, being the most energetically demanding organ in the body, is intrinsically linked to several metabolic pathways that regulate energy and nutrient supply. In this article, we will explore the intersection between metabolic pathways and mental health, highlighting how brain metabolism influences emotional balance and the onset of neuropsychiatric disorders.

The brain as energy consumer

The human brain represents only 2% of the body weight, but consumes approximately 20% of the total energy of the organism. This high energy demand is due to its involvement in cognitive processes, such as thinking, memory, decision-making and emotional regulation. The main source of energy for the brain is glucose, which is broken down by glycolysis and oxidative phosphorylation to produce adenosine triphosphate (ATP), the energy currency of our cells.

Brain metabolism and emotional regulation

Brain metabolism is also linked to emotional regulation through various metabolic pathways. Serotonin, a key neurotransmitter involved in mood and anxiety, is synthesized from the amino acid tryptophan, which is regulated by metabolism. In addition, the production and balance of other neurotransmitters, such as dopamine and GABA (gamma-aminobutyric acid), are influenced by metabolic pathways and can affect emotional well-being.

Metabolic pathways and neuropsychiatric disorders: Main indicators

Dysfunction in brain metabolic pathways has been associated with various neuropsychiatric disorders. For example, type 2 diabetes, a metabolic disease characterized by insulin resistance, has been linked to an increased risk of developing depression and anxiety disorders. Chronic inflammation, which is influenced by metabolism, has also been implicated in disorders such as schizophrenia and bipolar disorder.

Metabolic pathways also provide valuable indicators for the diagnosis and monitoring of various neuropsychiatric disorders. In the following, we will explore some specific metabolic pathways that have been the subject of research in the mental health field:

  1. Tryptophan Pathway and Serotonin Synthesis: Tryptophan is an essential amino acid that plays a key role in the synthesis of serotonin, a neurotransmitter associated with mood regulation and emotional well-being. Alterations in the availability of tryptophan or enzymes involved in its metabolism can affect serotonin levels and have been associated with depressive disorders.
  2. Fatty Acid Pathway and Neuroinflammation: Fatty acids are essential components of cell membranes and also act as precursors of proinflammatory and anti-inflammatory mediators. Regulation of fatty acid metabolism may influence neuroinflammation, a process implicated in disorders such as schizophrenia and bipolar disorder.
  3. Glutamine and GABA Metabolism Pathway: Glutamine is an amino acid that acts as a precursor of gamma-aminobutyric acid (GABA), a key inhibitory neurotransmitter in the brain. Alterations in the regulation of this pathway can affect GABA function and have been linked to anxiety disorders and epilepsy.
  4. Homocysteine Metabolism and Neurovascular Disease Pathway: Homocysteine is an amino acid whose elevated blood levels have been associated with an increased risk of neurovascular disease and cognitive impairment. Its metabolism is influenced by B vitamins, suggesting a link between nutrition and brain health.
  5. Folate Metabolism and Postpartum Depression Pathway: Folate, a B vitamin essential for homocysteine metabolism, has been studied in relation to postpartum depression. It has been observed that low folate levels may increase the risk of depression after childbirth.

Research into these and other metabolic pathways opens up new possibilities for the diagnosis and monitoring of neuropsychiatric disorders. Beyond You analyzes the expression of genes associated with the various pathways mentioned above for the measurement of specific metabolic biomarkers can provide important information about the physiological state of the brain and help identify possible metabolic dysfunctions related to mental illness.Importantly, interpretation of the results of these biomarkers should be done with caution and in an integrated manner with other clinical and diagnostic data.

As we advance our understanding of the complex relationship between metabolic pathways and mental health, new opportunities for improved early diagnosis and personalized treatment of neuropsychiatric disorders are likely to emerge.

The role of nutrition in mental health

Adequate and balanced nutrition is essential for maintaining the proper functioning of brain metabolism and thus for emotional well-being. Intake of nutrients such as omega-3 fatty acids, B vitamins and antioxidants has been associated with healthy brain function and reduced risk of depression and anxiety.

Research advances and challenges

The connection between metabolic pathways and mental health is a fascinating and promising area of research. Brain metabolism plays a crucial role in emotional regulation and may influence the onset of neuropsychiatric disorders.
Understanding this interaction may open new doors for the development of innovative therapies that address mental health disorders from a metabolic perspective.

Although advances in research have provided a deeper understanding of the connection between metabolic pathways and mental health, significant challenges remain. The complexity of the brain and its relationship to metabolism require a multidisciplinary approach involving neuroscientists, biochemists, psychiatrists and other experts to advance the field.


Transcriptomics is a discipline that focuses on the study of transcripts, i.e., the RNA molecules that result from DNA transcription. These transcripts are responsible for carrying genetic information from DNA to proteins, and their analysis can provide detailed insight into how genes are being expressed at any given time.

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