3 Essential Nutrients You May Be Missing From Your Diet

Life gets busy, and eating well can sometimes take a back seat. Whether you have been relying on convenience foods, skipping meals, dealing with a stressful period, or simply struggling to find time to prepare balanced meals, it is not always easy to meet your nutritional needs. Over time, a diet that lacks variety may leave you short of certain essential nutrients. You might notice fatigue, weakness, or difficulty concentrating, although these symptoms can have many possible causes and do not necessarily indicate a nutritional deficiency.

Three nutrients worth understanding are iron, vitamin B12, and magnesium. Each plays an important role in keeping the body functioning properly, from transporting oxygen and supporting healthy nerves to regulating muscle function.

The good news is that a varied diet can help provide many of the nutrients your body needs. If you suspect a deficiency, however, it is important to identify the cause rather than simply start taking supplements.

Iron and Oxygen Levels

Iron is essential for making haemoglobin, the protein in red blood cells that carries oxygen from the lungs to the rest of the body. When iron levels become too low, the body may not produce enough healthy red blood cells, potentially leading to iron-deficiency anaemia.

Symptoms can include persistent tiredness, weakness, headaches, dizziness, shortness of breath, and heart palpitations. However, these symptoms are not exclusive to low iron, so testing is important before deciding on treatment. The NHS explains the symptoms, causes, and treatment of iron-deficiency anaemia.

What can cause low iron?

Iron deficiency can develop for several reasons, including:

• Heavy menstrual periods: Regular blood loss can gradually deplete the body’s iron stores.
• Insufficient dietary iron: A diet that does not provide enough iron may contribute to deficiency.
• Pregnancy: Iron requirements increase during pregnancy.
• Problems absorbing nutrients: Certain digestive conditions can interfere with iron absorption.
• Blood loss: Bleeding in the digestive tract, including from ulcers or other medical conditions, can cause iron deficiency.

Unexplained iron deficiency should always be investigated. Although diet and heavy periods are common contributors, a healthcare professional may need to look for other causes, particularly when there is no obvious explanation.

How can you get more iron?

Iron is found in both animal and plant foods. Sources include lean meat, seafood, lentils, beans, chickpeas, tofu, fortified cereals, and dark green leafy vegetables.

There are two main dietary forms of iron: haem iron, found in animal foods, and non-haem iron, found in plant foods and fortified products. Vitamin C can help the body absorb non-haem iron, so combining plant-based iron sources with foods such as bell peppers, citrus fruits, strawberries, or broccoli can be beneficial.

If blood tests confirm iron deficiency, treatment may involve iron supplements and addressing the underlying cause. Some people require intravenous iron when oral treatment is unsuitable or insufficient. Recovery varies, and iron levels may take months to replenish fully. Do not start high-dose iron supplements without appropriate medical advice, as excess iron can be harmful.

Vitamin B12 and Nerve Health

 

Vitamin B12 is essential for healthy nerve function, red blood cell formation, and DNA production. A deficiency can develop when someone does not consume enough B12 or when the body cannot absorb it properly.

Possible symptoms include fatigue, weakness, numbness or tingling in the hands and feet, balance difficulties, memory problems, and certain types of anaemia. Neurological symptoms can occur even without anaemia, which is one reason persistent or unexplained symptoms deserve medical attention.

Who may be at risk of vitamin B12 deficiency?

Vitamin B12 occurs naturally in foods such as fish, meat, poultry, eggs, milk, and other dairy products. People who follow vegan diets may be at greater risk if they do not regularly consume foods fortified with B12 or take an appropriate supplement.

However, diet is not the only factor. Some people have difficulty absorbing B12 because of digestive conditions, previous gastrointestinal surgery, or a lack of intrinsic factor, a protein needed for normal B12 absorption. Certain medications can also contribute to low B12 levels.

How can you get enough vitamin B12?

Good sources include salmon, sardines, tuna, beef, eggs, milk, and fortified breakfast cereals or plant-based milk alternatives.

If you follow a vegan diet, check product labels to ensure that your chosen foods are fortified with vitamin B12. A suitable supplement may also be necessary.

If you suspect a deficiency, speak with a healthcare professional about testing. Treatment depends on the cause and severity and may involve oral supplements or injections. When absorption is impaired, simply changing your diet may not be enough.

For further information, the National Institutes of Health Office of Dietary Supplements provides a detailed guide to vitamin B12.

Magnesium and Muscle Function

Magnesium is an essential mineral involved in hundreds of processes throughout the body. It supports normal muscle and nerve function, helps regulate blood glucose and blood pressure, and contributes to bone health, protein production, and DNA synthesis.

Magnesium deficiency can cause symptoms such as fatigue, weakness, nausea, and, in more severe cases, muscle cramps, tingling, and abnormal heart rhythms. However, muscle cramps or tiredness alone do not establish that magnesium levels are low. Symptomatic deficiency is uncommon in otherwise healthy people.

What can contribute to low magnesium?

Several factors may increase the risk of magnesium deficiency, including:

• Digestive conditions: Persistent diarrhoea or conditions that interfere with nutrient absorption can lead to magnesium losses.
• Certain medications: Some medicines, including particular diuretics and long-term use of certain acid-reducing medications, can affect magnesium levels.
• Type 2 diabetes: Some people with diabetes experience increased magnesium losses through urine.
• Chronic heavy alcohol use: This can affect dietary intake, absorption, and the body’s magnesium balance.

If you have an ongoing health condition or take medication that may affect magnesium levels, discuss your risk with a healthcare professional rather than assuming that a supplement is needed.

How can you increase your magnesium intake?

Magnesium is found in a variety of everyday foods, including:

• Pumpkin seeds, almonds, and other nuts
• Spinach and other leafy green vegetables
• Black beans and lentils
• Whole grains
• Quinoa
• Some dairy products

For many people, eating a varied diet that includes these foods is a practical way to improve magnesium intake.

Magnesium supplements are available, but they are not necessary for everyone. High doses can cause diarrhoea, nausea, and abdominal cramps, and magnesium can interfere with the absorption of certain medications, including some antibiotics. People with impaired kidney function may also be at greater risk from excess magnesium.

Before taking a supplement, check with a pharmacist or healthcare professional, particularly if you take prescription medication or have an ongoing medical condition. The NIH Office of Dietary Supplements explains magnesium’s benefits, recommended intakes, potential risks, and medication interactions.

When Should You Seek Medical Advice?

Eating a balanced diet is an important part of looking after your health, but it is not a substitute for investigating persistent symptoms.

If you have ongoing fatigue, weakness, dizziness, unexplained changes in your health, or concerns about your diet, a healthcare professional can assess your symptoms and determine whether blood tests or other investigations are appropriate. Depending on your symptoms, these may include tests for anaemia, iron stores, vitamin B12, or other possible causes.

Avoid taking high-dose supplements simply because you feel tired. The right treatment depends on what is causing your symptoms, and taking unnecessary supplements can sometimes be harmful.

The Takeaway: Small Changes Can Support Better Nutrition

You do not need to overhaul your entire diet overnight to start making healthier choices. Including a wider variety of vegetables, fruit, legumes, whole grains, nuts, seeds, and appropriate sources of protein can help you obtain the nutrients your body needs.

Iron, vitamin B12, and magnesium each play important roles in maintaining health, but low energy or other symptoms do not automatically mean you are deficient. Pay attention to persistent changes in how you feel, seek professional advice when needed, and focus on sustainable eating habits rather than relying on supplements alone.

Health note: This article is intended for general educational purposes and is not a substitute for individual medical advice, diagnosis, or treatment.