How Nutrition Impacts Stress

When it comes to stress, most people focus on external factors workload, life pressures, or lack of time. The problem is a lot of the time we can’t change the external factors. But one of the biggest influences on how we experience and respond to stress is often overlooked: our nutrition. I know it not the only thing when it comes to stress and burn out, but it’s something that we can control and it makes a massive difference. I recently did a talk in collaboration with the Edinburgh Chamber of Commerce and Hussle, and companies are putting in wellness programs because they have read the research regarding nutrition and stress.

As a nutritional therapist, I regularly see how what we eat can either support the body’s resilience to stress, or make it significantly worse. If you’re feeling constantly overwhelmed, anxious, or fatigued, your diet may be playing a bigger role than you realise.

The Stress Response Starts in the Body

Stress is not just a mental or emotional experience, it’s also physiological one. The body relies on a steady supply of nutrients to regulate hormones, support the nervous system, and maintain stable energy.

Without the right nutritional foundation, the body is far less equipped to cope with everyday stressors.

Blood Sugar Balance: The Foundation of Stress Resilience

One of the most important and underestimated factors in stress management is blood sugar regulation.

When your diet is high in refined carbohydrates, sugar, or you skip meals, blood sugar levels can fluctuate rapidly. This creates a cascade of effects:

• Energy crashes

• Irritability and mood swings

• Increased cortisol (stress hormone)

• Cravings for quick energy foods

These fluctuations place additional stress on the body, even if your external environment hasn’t changed.

On the other hand, balanced meals that include protein, healthy fats, and fibre help maintain steady blood sugar which directly supports a calmer, more stable mood.

Nutrients That Support the Stress Response

The body depends on specific nutrients to regulate the nervous system and produce stress hormones efficiently.

Some of the most important include:

• Magnesium – Often referred to as the “relaxation mineral,” it plays a key role in calming the nervous system and reducing feelings of tension. This is great before bed if your struggle with sleep.

• B Vitamins – Essential for energy production and supporting the adrenal glands, which are central to the stress response.

• Omega-3 fatty acids – Help regulate inflammation and support brain health, which can improve mood and resilience.

• Protein (amino acids) – Needed to produce neurotransmitters like serotonin and dopamine, which influence mood and emotional stability.

A lack of these nutrients can make you feel more anxious, wired, or unable to cope, even with relatively minor stressors.

The Gut-Brain Connection

One of my favourite things to talk about it the gut brain axis because there so much research and I find it fascinating. There is a direct communication pathway between the gut and the brain, often referred to as the gut-brain axis.

Your gut health plays a crucial role in:

• Neurotransmitter production

• Mood regulation

• Inflammation levels

In fact, a large proportion of serotonin the “feel good” neurotransmitter is produced in the gut.

A diet lacking in fibre, plant diversity, and beneficial nutrients can negatively impact gut health, which in turn may increase feelings of stress, anxiety, and low mood.

Caffeine, Alcohol, and Hidden Stressors

While commonly used to cope with stress, both caffeine and alcohol can actually increase the body’s stress load.

• Caffeine can stimulate the release of cortisol and contribute to feelings of anxiety or restlessness

• Alcohol may initially feel relaxing, but can disrupt sleep and blood sugar, ultimately worsening stress

Reducing reliance on these can significantly improve how your body handles stress over time.

Undereating and Over-Restricting

Another common issue I see is under-eating or overly restrictive diets.

When the body is not receiving enough calories or nutrients, it perceives this as a stressor. This can lead to:

• Increased cortisol levels

• Hormonal imbalances

• Fatigue and poor concentration

• Heightened anxiety

Eating enough and eating regularly is fundamental for a stable stress response.

Simple Ways to Support Stress Through Nutrition

If you’re looking to improve your resilience to stress, here are some practical starting points:

• Eat regular, balanced meals (every 3–4 hours)

• Include protein with every meal

• Add healthy fats to support sustained energy

• Increase intake of whole, unprocessed foods

• Stay hydrated

• Incorporate magnesium-rich foods like leafy greens, nuts, and seeds

Final Thoughts

Nutrition is not just about physical health, it is a cornerstone of emotional and mental wellbeing.

If your body is undernourished, imbalanced, or struggling to maintain stable energy, it will be far more sensitive to stress. But when you provide it with the right building blocks, your capacity to cope, adapt, and feel balanced can improve dramatically.

Stress may be inevitable in modern life but how your body responds to it is something you can influence every single day through the food you eat.