Of all the nutrients I discuss with clients, magnesium is the one that most often gets overlooked until something starts going wrong — persistent tiredness, muscle cramps that wake you up at night, or a general sense of "wired but exhausted" that doesn't resolve no matter how much sleep you get. Magnesium is an essential mineral involved in over 300 processes in the body, including energy production, nerve function, muscle contraction, and the regulation of blood sugar and blood pressure. As a registered nutritionist, I see many clients who are running low on magnesium without realising it, simply because it isn't a nutrient that gets much attention compared to something like protein or vitamin D.
Why Magnesium Is So Easy to Fall Short On
Part of the reason magnesium deficiency is so common is that modern diets, high in processed food and lower in leafy greens, wholegrains, nuts and seeds, simply don't provide as much as they used to. Stress also depletes magnesium more quickly, which creates a frustrating cycle: a stressful period increases your body's need for magnesium at exactly the time your levels are being used up faster, potentially leaving you feeling even more depleted, tense, and poorly rested.
Magnesium, Weight and Blood Sugar
A magnesium shortfall can have a knock-on effect on weight management efforts, as magnesium plays a role in the body's ability to regulate blood sugar levels and insulin sensitivity. When blood sugar regulation is less stable, cravings and energy crashes tend to follow, which can make sticking to a balanced way of eating considerably harder — not because of a lack of willpower, but because the underlying biology is working against you. Magnesium is also relevant for diabetes nutrition, given its involvement in insulin sensitivity, though if you have diagnosed diabetes I'd always recommend discussing any significant dietary or supplement changes with your GP or a registered dietitian first, particularly around anything that might interact with your medication.
Magnesium and Gut Health
Magnesium is also important for gut health, as it helps regulate the balance of gut bacteria and supports normal bowel function — which is part of why magnesium-rich foods (or, in some cases, supplements under guidance) are sometimes recommended for constipation. If you're dealing with ongoing digestive symptoms, it's worth looking at magnesium intake alongside fibre and hydration, rather than any one of these in isolation.
Magnesium and Hormonal Health
Magnesium also plays a role in hormonal health, particularly for women. Some clients find that adequate magnesium intake is one useful piece of the puzzle in managing symptoms associated with menopause nutrition, such as disrupted sleep and general tension, and it's also relevant to cycle regularity for women managing PCOS nutrition. I want to be clear that magnesium isn't a standalone fix for any of these — it's one supportive factor within a much wider pattern of diet, sleep, movement and stress management, and I'd never present it as a substitute for appropriate medical care for a diagnosed condition.
Magnesium Across Life Stages
Magnesium is also important for children's nutrition, supporting healthy growth and development, so it's worth making sure family meals include a reasonable spread of magnesium-rich foods rather than thinking of this purely as an adult concern. Magnesium's involvement in appetite and metabolism regulation is also part of why it comes up in conversations about GLP-1 support, where I help clients think about the wider nutritional picture around their treatment, in coordination with their prescribing clinician.
Food Sources of Magnesium
So, how can you realistically boost your magnesium intake through food? The best approach is a balanced diet that regularly includes magnesium-rich foods rather than relying on a single "magic" ingredient. Good sources include:
- Dark leafy greens such as spinach and kale
- Nuts, particularly almonds and cashews
- Seeds, especially pumpkin and chia seeds
- Wholegrains such as brown rice, oats and quinoa
- Legumes, including black beans and chickpeas
- Dark chocolate (in reasonable amounts) and bananas
A simple, practical habit I suggest to clients is adding one magnesium-rich food to each main meal — a handful of spinach in a curry, pumpkin seeds sprinkled over porridge, or a side of black beans with dinner — rather than trying to overhaul the whole diet at once. Small, repeatable additions like this tend to stick far better than a complete rebuild of your eating pattern.
What About Supplements?
Some people do consider a magnesium supplement, particularly if food sources alone aren't enough or symptoms persist. I'd always recommend speaking with a healthcare professional or registered nutritionist before starting any new supplement, since the right form and amount can vary by individual, and magnesium can interact with certain medications. This is a conversation worth having properly rather than picking something off a shelf based on a headline.
Conclusion and Next Steps
Magnesium is an unglamorous but genuinely essential mineral, and getting enough of it can have a meaningful knock-on effect on energy, sleep, mood and blood sugar stability. If you're concerned about your magnesium levels or would like to learn more about how to boost your intake sustainably, consider booking an online consultation with a registered nutritionist. In my one-to-one sessions, I look at your whole diet and lifestyle, not just one mineral in isolation, to build a personalised plan that meets your specific needs and goals. If you would like personalised support with your nutrition, I offer one-to-one online consultations as a registered nutritionist. View my consultation packages or book a free discovery call to discuss how I can help.