Feeling constantly exhausted, struggling to concentrate, or waking up tired even after a full night's sleep? It's easy to assume you're experiencing burnout. But while chronic stress is a common cause of fatigue, it's not the only one.
Deficiencies or even suboptimal levels of certain nutrients can produce symptoms that closely resemble burnout, including low energy, brain fog, poor concentration, low motivation and disrupted sleep. In many cases, ongoing fatigue may be driven by stress, nutrient depletion, or a combination of both.
For broader context on fatigue and nutrients, read Experiencing fatigue? Remedy it with the right nutrients.
What is burnout?
Burnout is a state of physical, mental and emotional exhaustion caused by prolonged or chronic stress. It often develops after extended periods of work pressure, emotional strain, poor recovery and difficulty switching off. Over time, burnout can leave you feeling overwhelmed, emotionally drained and less able to cope with everyday demands.
What is nutrient depletion?
Nutrient depletion occurs when your body does not have enough of the vitamins and minerals needed to support normal functions such as energy metabolism, oxygen transport, nervous system function and muscle function. This can result from an inadequate diet, restrictive eating patterns, poor nutrient absorption, increased nutritional needs or simply not maintaining optimal nutrient levels over time.
Why burnout and nutrient depletion can feel so similar
Burnout and nutrient depletion share many of the same symptoms. Both can leave you feeling constantly tired, mentally foggy, unmotivated, irritable and unable to perform at your best.
This overlap is why many people assume stress is the only explanation. If work has been demanding, life feels overwhelming or winter has disrupted your routine, it's natural to think, "I'm just burnt out." However, stress isn't always the complete picture.
Diet changes, skipped meals, low food variety, reduced sunlight exposure and increased nutritional demands can all contribute to fatigue without obvious warning signs. Because these symptoms are so non-specific, nutrient depletion can easily go unnoticed or be mistaken for burnout.
Patterns that may point more towards burnout
Some people describe it as tired but wired. You are exhausted, yet your mind keeps running anyway. A short break helps a little, but not enough, because the pressure is still there.
- Feeling emotionally drained as much as physically tired
- Trouble switching off at night
- Irritability or feeling detached from work
- Exhaustion that closely follows stressful periods
- Recovery habits slipping because life feels too full
These are not a diagnosis. They are simply patterns worth noticing. If this sounds familiar, read through "Is your nervous system in overdrive? Here's how to tell" for more context on what ongoing overdrive can look like.
Nutrient deficiencies to consider when you feel burnt out
Low or suboptimal levels of key nutrients can contribute to fatigue and produce symptoms that closely resemble burnout. Where fatigue relates to low nutrient intake, maintaining adequate levels through diet and, where appropriate, supplementation may support energy and wellbeing
IronÂ
Iron is essential for making haemoglobin, which carries oxygen around the body, and supports normal energy production. When iron levels are low, symptoms such as fatigue, brain fog, poor concentration, headaches and reduced stamina can closely resemble burnout.
People with heavy menstrual bleeding, low red meat intake, restrictive diets or a history of iron deficiency may be at higher risk.
If you suspect low iron, speak with your healthcare provider about a full iron panel, including ferritin, transferrin and haemoglobin, to accurately assess your iron status. A complete blood count (to assess haemoglobin) would be a good idea too.
For broader context on fatigue and nutrients, see Experiencing fatigue? Remedy it with the right nutrients.
Vitamin B12
Vitamin B12 is a water-soluble vitamin that supports red blood cell formation, energy production, DNA synthesis, and healthy brain and nervous system function. Low B12 levels may cause fatigue, brain fog, weakness, and mood changes, making them easy to confuse with burnout.
Vitamin B12 deficiency is more common in vegans, some vegetarians, and people with absorption-related conditions, so if you're experiencing ongoing tiredness or cognitive symptoms, it's worth discussing a B12 test with your healthcare provider. For more on forms used in supplements, see Why activated B vitamins.
Magnesium
Magnesium is an essential mineral involved in over 600 enzymatic reactions, including energy production, muscle function, and nervous system health. Low magnesium levels may contribute to fatigue, muscle weakness, poor sleep, and difficulty managing stress, as magnesium plays an important role in helping the body relax.
Maintaining adequate magnesium levels can support energy, recovery, and overall wellbeing. You can read more in How magnesium supplements benefit the body and mind.
Vitamin D
Vitamin D is a fat-soluble vitamin that supports bone health, immune function, and general health and wellbeing. Because vitamin D is primarily produced through sunlight exposure, levels commonly decline during winter due to reduced UVB exposure, more time spent indoors, and heavier clothing, making it worthwhile to consider your vitamin D status if you're feeling persistently low in energy.
What to do next if you feel depleted
If you're constantly feeling run down, try looking at the bigger picture before assuming it's simply burnout. Both stress and nutrient depletion can contribute to fatigue, so it's worth considering a few key factors.
Ask yourself:
- Has your stress been unusually high? Consider whether work, caregiving or emotional strain has been building over time.
- How well are you recovering? Are you getting enough quality sleep, and are you able to switch off mentally?
- Has your diet changed? Skipped meals, restrictive eating or a lack of variety can make it harder to meet your nutrient needs.
- Are you getting enough sunlight? Spending more time indoors, particularly during winter, can affect vitamin D levels.
- How long have you felt this way? Fatigue that persists or gradually worsens deserves further attention.
If your symptoms continue despite prioritising rest, managing stress and eating a balanced diet, it's a good idea to speak with a healthcare professional. They can assess whether an underlying health condition or nutrient deficiency may be contributing to your symptoms and advise whether blood tests or further investigation are appropriate.
Explore our range
Maintaining adequate nutrient levels through a varied diet, and where appropriate, supplementation, is one part of supporting everyday energy and wellbeing.
- Iron - provides 18 mg of iron with added vitamin C to help enhance the absorption of non-haem iron, to support the maintenance of normal iron levels.
- Essentials Daily + Iron - provides iron glycinate, activated B12 and vitamin D3 as part of a broader foundational formula, to help support the maintenance of general nutrient levels.
- Vitamin B12 in the form of methylcobalamin, a naturally occurring form of B12 that is essential for optimal body function, supports energy production, nervous system health and brain function.
- Magnesium is an essential mineral that supports muscle relaxation, nervous system health and brain function, energy levels and heart health.Â
Frequently Asked Questions
Can burnout cause physical fatigue?
Yes. Burnout is often described as mental or emotional exhaustion, but it can feel deeply physical too. Ongoing stress can leave you flat, unrefreshed, foggy and low on stamina.
Can low iron feel like burnout?
Yes, it can. Low iron and burnout can both show up as exhaustion, poor concentration and reduced capacity. Low iron is especially worth considering if you have heavy periods, low iron intake or a history of low iron status.
How do I know if my tiredness is stress or a nutrient issue?
You usually cannot tell with certainty from symptoms alone. A useful starting point is to look for patterns around stress load, diet quality, low animal-food intake, restrictive eating, heavy periods and low sun exposure. If symptoms persist, professional assessment is the sensible next step.
Should I get my nutrient levels checked if I feel constantly run down?
It is worth discussing with a healthcare professional if fatigue is ongoing, getting worse or affecting daily function. Testing can be especially relevant when there are clear risk factors such as heavy periods, restrictive eating, low animal-food intake, low sun exposure or previous deficiency history.
References
- National Institutes of Health Office of Dietary Supplements. Iron Fact Sheet for Health Professionals. Updated 2024. https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/
- National Institutes of Health Office of Dietary Supplements. Vitamin B12 Fact Sheet for Health Professionals. Updated 2024. https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
- National Institutes of Health Office of Dietary Supplements. Magnesium Fact Sheet for Health Professionals. Updated 2024. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
- National Institutes of Health Office of Dietary Supplements. Vitamin D Fact Sheet for Health Professionals. Updated 2024. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
- Australian Government Department of Health and Aged Care. Vitamin D and health. Accessed 2026. https://www.health.gov.au/topics/vitamins-and-minerals/about/vitamin-d
This is general information only and not medical advice.
