What is the amount of calcium absorbed at one time in the gastrointestinal tract?

• A. 250 mg
• B. 500 mg
• C. 750 mg
• D. 1000 mg

Answer: (B)

The correct amount of calcium that can typically be absorbed at one time in the gastrointestinal tract is approximately 500 mg. This figure is based on various studies that analyze how efficiently the body absorbs dietary calcium, which tends to vary with the amount consumed in a single dose.

When calcium is ingested, the intestines can only absorb a certain amount effectively. Research indicates that absorption becomes less efficient as the quantity of calcium increases, with peak absorption generally occurring around the 500 mg mark. Consuming calcium in amounts greater than this might lead to diminished absorption rates due to the body's regulatory mechanisms.

Understanding this absorption threshold is crucial for dietary recommendations, especially for individuals who need to meet specific calcium intake levels, such as postmenopausal women or individuals with conditions such as osteoporosis. It's important to spread calcium intake throughout the day to maximize absorption and support bone health effectively.