People with osteoporosis can increase their calcium intake through the following ways: 1. Eat calcium-rich foods such as milk, yogurt, cheese, and other dairy products. 2. Eat more green vegetables such as broccoli, cabbage, and spinach. 3. Eat calcium-rich fish like sardines and mackerel. 4. Opt for calcium-fortified foods like calcium-fortified orange juice and cereals. Additionally, vitamin D helps in calcium absorption, so ensure you get enough vitamin D through sunlight exposure and foods rich in vitamin D like egg yolks and cod liver oil.