Plant foods contain generous amounts of calcium. A cup of cooked collard greens contains about 360 mg of calcium, while a cup of milk contains about 300 mg. A cup of cooked kale contains 210 mg. There is NO disorder known as “dietary calcium deficiency” – in other words, there is plenty of calcium in all plant food diets to meet the needs of both children and adults alike. Osteoporosis is not a disease that results from too little calcium, but primarily from acids derived from too much animal protein that rob the body of calcium and thus weaken bones. A diet based on starches with a plentiful supply of fruits and vegetables, combined with modest exercise, will preserve skeletal strength and even regain lost bone mass.