Magnesium

What it is

Magnesium is a vital mineral that plays a crucial role in many of the body's processes. It's involved in over 300 biochemical reactions, helping to keep your nerves and muscles working properly, maintaining a steady heart rhythm, and supporting your immune system. It also contributes to bone health and helps regulate blood sugar levels. Your body doesn't produce magnesium, so you need to get it from your diet. Foods rich in magnesium include leafy green vegetables like spinach, nuts, seeds, whole grains, and some fish.

Why it matters

Magnesium is essential for overall health, and its levels in your blood can give doctors clues about how well your kidneys are functioning and how your body is handling this important mineral. The kidneys play a key role in regulating magnesium levels, filtering out excess amounts and reabsorbing what the body needs. When kidney function is impaired, this balance can be disrupted, potentially leading to changes in blood magnesium levels. Monitoring magnesium can therefore be part of assessing kidney health and overall well-being.

What can cause it to be high or low

Magnesium levels in the blood are typically measured in millimoles per litre (mmol/l). The usual range in the UK is between 0.7 and 1.1 mmol/l.

High Magnesium (Hypermagnesemia): This is less common and often occurs when the kidneys aren't filtering waste effectively, meaning excess magnesium isn't removed from the body as it should be. This can be associated with chronic kidney disease. In some cases, taking too many magnesium supplements or certain medications can also contribute to high levels.

Low Magnesium (Hypomagnesemia): Low magnesium levels can be seen in various situations. Sometimes, it's related to not getting enough magnesium from your diet, or if your body isn't absorbing it properly from your gut. Certain medical conditions, such as inflammatory bowel disease, can affect absorption. Diuretic medications, which help the body get rid of excess fluid, can sometimes lead to magnesium loss. Alcohol misuse can also impact magnesium levels. In individuals with kidney disease, while high levels are more common, sometimes low levels can occur due to specific issues with kidney function or treatments.

Lifestyle factors that may help

Maintaining healthy magnesium levels can often be supported through dietary choices and lifestyle adjustments. Focusing on a balanced diet rich in magnesium-containing foods is generally beneficial. This includes incorporating plenty of leafy green vegetables, nuts, seeds, and whole grains into your meals. Staying well-hydrated is also important for overall kidney function. Regular physical activity is another aspect that contributes to general health and can support the body's metabolic processes. If you have specific health conditions, discussing dietary and lifestyle changes with your healthcare team is always recommended.

Questions to discuss with your GP

If your magnesium levels have been discussed, or if you have concerns about your kidney health, here are some questions you might consider discussing with your GP:

• Could my current magnesium level be related to my kidney function?
• What are the potential causes for my specific magnesium level result?
• Are there any dietary changes that might be beneficial for me to consider?
• How do my current medications potentially interact with magnesium levels?
• What are the signs or symptoms I should be aware of if my magnesium levels were to change significantly?
• Are there any further tests or monitoring that would be helpful for me?