Osteoporosis is a condition where bones become weak and brittle, increasing the risk of fractures from minor accidents. It mostly affects women, especially after menopause when estrogen levels drop. Risk factors include a small body frame, low body weight, lack of exercise, smoking, heavy alcohol use, and certain medications. Maintaining bone health requires adequate calcium, vitamin D, and exercise daily. Calcium-rich foods and vitamin D sources like fish, eggs, and sunlight should be consumed, while limiting phytic acid from bran and oxalic acid from spinach that interfere with calcium absorption.