While rare, a deficiency in calcium can lead to numbness in the fingers and toes, muscle cramps, convulsions, lethargy, loss of appetite, and abnormal heart rhythms. A long-term deficiency can lead to bone loss (osteopenia) and fragile bones (osteoporosis). 

Conversely, excess calcium (particularly from supplements) can cause kidney stones, calcification of soft tissue, and increased risk of vascular diseases like stroke and heart failure. 

High calcium foods include tofu, milk, yogurt, cheese, leafy greens, beans, clams, okra, trout, and acorn squash. The daily value (DV) for calcium is 1300mg.

While there is some evidence that phytic acid and oxalic acid in beans and greens can hinder calcium absorption, green vegetables and beans are still a good source of calcium, and the calculated daily value (DV) already takes under consideration absorption and bio-availability.

The visual list of high calcium foods by a standard serving size, for more see the nutrient ranking of over 200 foods high in calcium is below. You can also see the lists of high calcium vegetables, and high calcium fruits.