Micronutrients and Fatigue: What the Research Says About Food and Energy

Persistent low energy is one of the most common complaints raised in a nutrition consultation, and while fatigue has many possible causes, several specific micronutrients have well documented, biochemically clear roles in how the body produces usable energy.

A narrative review published in Nutrients in 2020 by Tardy and colleagues examined the biochemical and clinical evidence for eight B vitamins alongside vitamin C, iron, magnesium, and zinc, concluding that each plays a specific and non interchangeable role in energy yielding metabolism, oxygen transport, or nervous system function, and that inadequate status in any of them can present as physical or mental fatigue. B vitamins, for instance, are essential cofactors in the citric acid cycle, the core biochemical pathway your cells use to generate ATP, the molecule that fuels almost every cellular process in the body.

Magnesium plays a related but distinct role. Beyond its involvement in the citric acid cycle, magnesium binds to ATP to form the biologically active complex your mitochondria actually use to export energy out of the cell. A separate review in Clinical Nutrition looked specifically at mitochondrial function and highlighted the roles of B vitamins, coenzyme Q10, and several trace elements in supporting the electron transport chain, the final stage of cellular energy production.

Iron deficiency, even at a level below clinical anaemia, has also been consistently linked to fatigue, largely because iron is required to carry oxygen to tissues that need it to generate energy efficiently.

The relevance for Mediterranean eating is direct rather than incidental. Leafy greens, legumes, whole grains, nuts, seeds, and oily fish collectively supply the majority of these nutrients in a single dietary pattern, which is one reason a genuinely well constructed Mediterranean plate tends to outperform a diet that is simply lower in processed food but nutrient sparse in other ways.