20/02/2026
WHAT CONSTITUTES A HEALTHY DIET?
Although there is consensus to help guide what the main constituents of a healthy(er) diet are, I argue that there is no such thing as a truly healthy diet that is ideal for everyone.
There are many foods subjectively perceived as healthy or unhealthy, which may be beneficial or detrimental for an individual, context matters. There is a baseline definition of healthy eating, and room for precision individualisation, but these concepts are not mutually exclusive, meaning that the two concepts can still be true at the same time.
A baseline assessment of a person’s antecedents, triggers and mediators, such as medically diagnosed conditions, past and current symptoms, dietary patterns, stressors, food allergies or intolerances, and lifestyle factors, as well as laboratory assessments and historical trends, is essential to personalise recommendations.
Let’s take the example of the methylation cycle shown in the image attached to this post. Methylation is a biochemical process involved in almost every reaction in the body, occurring billions of times every second in our cells and contributing to numerous essential bodily functions, including detoxification, immune function, DNA integrity, regulation of gene expression, energy production, neurotransmitter balance, inflammation control and telomere protection.
Environmental factors, such as chemical or drug exposures and stress, but especially nutrients known as cofactors that are required for these reactions to occur, play a critical role in supporting or hampering methylation. Imbalances in any of these cofactors, whether due to dietary shortfalls or impaired digestion or absorption, may also hinder methylation. Impaired methylation may contribute to major chronic conditions such as fertility issues, fatigue, cardiovascular disorders, neurodegeneration, allergies, mood disorders, anxiety, cancer and more.
However, the presence of genetic variants inherited from our parents known as Single Nucleotide Polymorphisms (SNPs) that occurs at various points within the methylation cycle (which everyone has), and which I often assess via genetic testing, can influence whether particular points within a pathway are up- or down-regulated, such as the requirement for Folate (Vitamin B9), image attached.
These SNPs matter, and may subsequently impact gene function and disease risk or predisposition, providing added nuance regarding how much more or less of specific nutrients or foods a person may require to support or bypass weaknesses or “bottlenecks” that could be contributing to symptoms and predisposition to certain chronic health conditions.
Although an individual’s genetic code cannot be changed, the rate and manner of gene expression, protein synthesis and function can be supported through personalised nutrition, as evidenced by a large body of nutrition science research. This is just one small example of the science involved in Nutritional Therapy and what I have trained in over the past seven years.
It requires a deep holistic understanding of where a person’s strengths and weaknesses may lie, this takes time to analyse and understand, which explains why it requires working longer term. An example of why recommending identical dietary and lifestyle advice to everyone can be inefficient and, in some cases, totally inappropriate. Get in touch to work with me to improve your health.
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