The link between nutrition and mental wellbeing

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The body keeps score in ways we don’t realise. We usually think about mental health and wellbeing in the context of thoughts, emotions and relationships, but it affects us physically too. That’s one reason nutrition matters, especially during difficult times, like going through addiction recovery. Eating well is not a cure for anxiety, depression or trauma, but it does make a difference to energy, sleep, stress tolerance and mood. And that difference can improve daily life.

At Marrin Weejali, we offer culturally sensitive drug and alcohol recovery and emotional support programs for Aboriginal and non-Indigenous people in Western Sydney. Repairing shattered spirits is a process that involves many steps. Paying attention to nutrition can be a helpful part of that process, not for appearance or fitness goals, but because it genuinely supports your mental state.

Nutritional psychiatry is a growing area of research looking at how overall eating patterns affect mental health. Its focus is on the quality of the entire diet rather than single vitamins or supplements. A recent Australian study (the SMILES trial) found that adults with major depressive disorder who embraced a Mediterranean style of eating, more vegetables, fruit, whole grains, legumes, nuts, olive oil and fish, and fewer processed foods and added sugars, experienced a greater improvement in their symptoms than those who received social support only.

One reason food is linked to mental health relates to the gut-brain axis, the signalling pathway between the digestive system and the brain. What we eat alters the population of bacteria in the gut, and those microbes produce chemicals that influence inflammation and the body’s stress response. Researchers are still determining how direct these effects are, but a growing body of evidence links disrupted gut health with higher rates of depression and other mood disorders.

Modern observational research does tend to agree that ultra-processed foods are linked with poorer physical and mental health outcomes across populations. Ultra-processed foods are typically industrial formulations that are high in added sugars, refined starches, unhealthy fats, flavour enhancers and additives. And they’re low in the good stuff, like fibre and other important micronutrients.

It’s not only what you eat that matters, but how regularly you eat. Skipping meals can drop glucose levels in the body, and low blood sugar often leads to irritability, fatigue, shakiness and difficulty concentrating. And when you’re already under stress, those negative physical sensations can heighten emotional reactivity and make it even harder to manage cravings or conflict.

Eating at regular intervals helps maintain more stable blood glucose levels. In turn, this supports steadier energy, clearer thinking and fewer crashes. Because restlessness, low motivation or irritability often come with those crashes, they can be mistaken for anxiety, when it may simply be your body calling out for a meal.

The good news is, you can eat a healthy, balanced diet without making life too complicated. What does this involve? Start by trying to include protein, fibre-rich carbohydrates and a small amount of health fats with each meal.

Why does nutrition matter for those recovering from substance abuse? The early stages often come with significant shifts in physical and emotional wellbeing. Appetite can fluctuae from very low to unusually high, and sleep is often disrupted, which has a domino effect on hunger hormones and energy. Low mood and fatigue are common, and they can reduce motivation to shop, cook or eat regular meals. Perfection is not the goal. It’s unrealistic. Consistency matters more. Start with simple, repeatable meals at regular times.

If you’re in recovery, you will likely already be in a state of nutrient depletion. Long-term alcohol use, in particular, is associated with deficiencies in key nutrients such as thiamine, folate, vitamin B12 and magnesium. Poor appetite, gastrointestinal issues and limited dietary variety during active substance use can also contribute to malnutrition, which affects cognition, mood and nerve function. As the body begins to stabilise in recovery, regular, balanced meals support physical repair.

For some people, recovery will involve more than just improving daily meals. If there are underlying medical conditions, severe withdrawal symptoms or signs of significant deficiency, medical supervision may be needed while the body rebuilds.

If you’re going through addiction recovery and want to improve your diet to support your mental health, keep it practical and start with small, manageable changes. Eat breakfast consistently. Plan simple meals using affordable staples like vegetables, lean protein, whole grains and nuts. Keeping things straightforward reduces decision fatigue and makes it easier to stay on track, especially on days when cooking feels like too much.

At Marrin Weejali, we can support you through the entire process with compassion and sensitivity. And we work closely with health care providers, community services and local partners to make sure people can access the full range of help they need.

If you or someone you know is struggling with addiction, our programs offer holistic care for individuals, families and communities.

You are welcome at Marrin Weejali.

Contact us for a confidential discussion.