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Updated: Mar 27

What is Calcium?

Calcium is naturally present in the body and plays an essential role in various physiological functions, including bone health, muscle contraction, nerve transmission and blood clotting. A certain amount of calcium is normally excreted in the urine as part of the body's natural processes for maintaining calcium balance.

How can the levels be affected?

Calcium in the urine can be influenced by various factors which may be linked to physical activity:

  1. Hydration status: Dehydration can lead to increased concentration in the urine, which can increase the risk of calcium crystallisation in kidneys.

  2. Exercise-induced calcium loss: Intense or prolonged exercise can lead to increased loss of calcium through sweat. Athletes involved in endurance sports or activities with high rates of sweating may experience greater urinary excretion of calcium, as the body strives to maintain calcium balance.

  3. Bone renewal: Exercise, particularly weight-bearing and resistance training, stimulates bone renewal and remodelling. This process can temporarily increase calcium excretion in urine, as the body adapts to the demands of physical activity and bone remodelling.

  4. Dietary factors: Calcium levels in urine can be influenced by dietary intake. Athletes who consume calcium-rich foods, such as dairy products, green leafy vegetables, nuts and seeds, may have higher levels of urinary calcium excretion than those who consume less calcium.

  5. Acid-base balance: The body's acid-base balance, influenced by factors such as diet and exercise, can affect urinary calcium excretion. Diets high in protein and low in fruit and vegetables can lead to a more acidic urinary pH, which can increase calcium excretion and the risk of calcium crystallisation forming in kidneys.

  6. Bone health: Regular weight-bearing exercise is important for maintaining bone health and density. Athletes who engage in weight-bearing activities may have higher rates of bone turnover and urinary calcium excretion as part of the adaptive response to exercise.

Overall, the presence of calcium in the urine may reflect a combination of factors related to hydration, dietary intake, exercise intensity and bone turnover. Moderate levels of urinary calcium excretion are normal and necessary to maintain calcium balance in the body.

How can I maintain an optimal rate?

Maintaining optimum levels of calcium in the urine involves a number of strategies:

  • Stay well hydrated: Drink sufficient water throughout the day to maintain good hydration. Good hydration prevents urine from becoming too concentrated, which can reduce the risk of calcium crystallisation and the formation of kidney stones.

  • Balanced diet: Adopt a balanced diet that includes calcium-rich foods.

Dairy products

Leafy green vegetables

Almonds and nuts









Cashew Nuts




Tofu and tempeh are also rich in calcium for people following a vegan or vegetarian diet.

  • Limit caffeine and alcohol: Excessive consumption of caffeine and alcohol can increase urinary excretion of calcium. Moderate consumption of caffeinated drinks (coffee, tea, soda) and alcoholic beverages can help maintain optimal levels of calcium in the urine.

  • Regular physical exercise: Engage in regular physical activity, including weight-bearing exercises, to help bones adapt to healthy stress. Weight-bearing exercises help to strengthen bones and promote calcium retention in the body.

By incorporating these strategies into your lifestyle, you can help maintain optimal levels of calcium in the urine.

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