Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, treating addiction, reversing opioid overdose, suppressing cough, and suppressing opioid induced constipation.
Other foods that are high in calcium include: 1  Spinach. 2  Kale. 3  Okra. Collards. 4  Soybeans. White beans.  Some fish, like sardines, salmon, perch, and rainbow 1  trout. Foods that are calcium-fortified, such as some orange juice, oatmeal, and breakfast  cereal.
Foods such as canned fish eaten with their bones, green leafy vegetables, nuts such as almonds, cereals and legumes also contribute calcium to the diet, but in much smaller amounts than dairy foods. Some plant sources of calcium may contain phytates and oxalates that reduce the uptake of calcium by the body.