calciumbalansen

Calciumbalansen, or calcium balance, is the physiological balance between calcium intake and calcium losses in the body. It reflects whether total body calcium stores, particularly in bone, are increasing, stable, or decreasing. Net balance is calculated as intake minus losses from feces, urine, sweat, and other routes.

Calcium homeostasis is regulated mainly by hormonal and renal–intestinal mechanisms. Parathyroid hormone (PTH) increases serum calcium by promoting bone resorption, increasing renal calcium reabsorption, and stimulating production of active vitamin D (calcitriol) in the kidney, which in turn enhances intestinal calcium absorption. Calcitonin can oppose bone resorption but plays a relatively minor role in humans. Vitamin D status strongly influences intestinal calcium absorption, while renal function affects calcium excretion. Bone remodeling continuously balances calcium storage and release in response to these signals, nutritional intake, and physical activity.

Life stage and health status determine whether calcium balance is positive, neutral, or negative. Children and adolescents, pregnant or lactating individuals, and those with high dietary calcium intake or vigorous bone growth often exhibit positive balance. Adults with adequate intake typically maintain near-zero balance, while older adults, individuals with malabsorption, or those with low vitamin D or kidney disease may experience negative balance and potential bone loss if not addressed.

Dietary intake, vitamin D status, and lifestyle factors influence balance. Common recommendations aim for sufficient daily calcium (approximately 1,000 mg for adults, higher for some groups) and adequate vitamin D to support absorption. Understanding calciumbalansen informs bone health, nutrition, and endocrine function.