Molecular mechanisms triggered by low-calcium diets.

Area of Science:

• Biochemistry
• Human Physiology
• Nutritional Science

Background:

• Calcium (Ca) is vital for bone mineralization and regulating cellular functions.
• Low calcium intake triggers adaptive mechanisms like increased intestinal absorption and renal reabsorption, mediated by parathyroid hormone and calcitriol.
• Dietary calcium influences lipid metabolism, adipocyte function, and has implications for chronic diseases.

Purpose of the Study:

• To review the multifaceted roles of calcium in human health.
• To explore the consequences of low dietary calcium intake on bone health, renal function, and metabolic processes.
• To examine the association between dietary calcium and conditions such as osteoporosis, renal lithiasis, obesity, hypertension, and colorectal cancer.

Main Methods:

• Literature review of studies investigating calcium's physiological roles and dietary impacts.
• Analysis of research on calcium's effects on bone metabolism, kidney function, and endocrine regulation.
• Examination of epidemiological and experimental data linking dietary calcium to various health outcomes.

Main Results:

• Low calcium intake is a risk factor for osteoporosis and may increase recurrence of renal lithiasis.
• Dietary calcium influences adipocyte apoptosis and glucocorticosteroid metabolism, potentially explaining inverse relationships with BMI.
• Calcium intake is inversely associated with hypertension and may play a role in colorectal cancer prevention through mechanisms involving bile acids and immune modulation.

Conclusions:

• Calcium is essential for maintaining bone health and plays a significant role in metabolic regulation.
• Inadequate calcium intake can contribute to serious health conditions, including osteoporosis, kidney stones, and potentially metabolic syndrome.
• Health professionals should emphasize adequate dairy intake to meet recommended calcium requirements and prevent associated diseases.