Magnesium: An Underrated Ally for Active People

Magnesium doesn't get the same spotlight as protein or creatine, but it's involved in hundreds of processes in the body — including several that matter directly to anyone who trains regularly: energy production, muscle contraction and relaxation, and nerve function.

Why athletes are prone to running low

Magnesium is lost through sweat, and people who train intensely or frequently sweat more than the sedentary population the general intake guidelines are built around. On top of that, diets heavy in processed food (and light on leafy greens, nuts, seeds, and whole grains) tend to fall short of recommended magnesium intake even before accounting for exercise losses.

Signs of a possible deficiency

• Muscle cramps or twitches, especially at night or after hard training sessions
• Persistent fatigue not explained by sleep or training load
• Trouble sleeping or restlessness
• Irritability or difficulty concentrating

These signs aren't specific to magnesium alone, so they're a reason to look closer (and talk to a doctor if they persist), not a diagnosis on their own.

Food sources worth prioritizing

Pumpkin seeds, almonds, cashews, spinach and other leafy greens, black beans, avocado, and dark chocolate are all solid magnesium sources that fit easily into a normal diet.

On supplementation

For most people eating a varied diet, food sources are enough. Supplementation can help close a genuine gap — particularly for athletes with high sweat losses or restrictive diets — but more isn't automatically better; magnesium in large doses can cause digestive upset. As with any supplement, it's worth checking with a healthcare provider before adding it, especially alongside other medications.

The takeaway

Magnesium is easy to overlook because deficiency symptoms are vague and it doesn't have the marketing budget of flashier supplements — but for anyone training regularly, it's worth paying attention to.