Which of the following is the main dietary source of calcium?

Dairy products are the main dietary source of calcium due to their high concentration of this essential mineral, which is crucial for bone health and various metabolic processes. Milk, yogurt, and cheese are particularly rich in calcium, making them excellent choices for those looking to meet their calcium requirements. The calcium found in dairy products is also highly bioavailable, meaning it is easily absorbed by the body.

While leafy greens, legumes, and nuts contain calcium, they often do so in lower amounts and may also contain compounds that inhibit calcium absorption, such as oxalates in spinach or phytates in legumes. Therefore, although these food groups contribute to calcium intake, dairy products are the most concentrated and effective source for fulfilling the body's calcium needs.