Here is a description of a few believed to play a role in depression: 1  Acetylcholine enhances memory and is involved in learning and recall. 2  Serotonin helps regulate sleep, appetite, and mood and inhibits pain. Research supports the idea that some depressed people have reduced serotonin transmission.
Osteoporosis, which means porous bone, is a disease in which the bones gradually become weak and brittle. The condition often results in broken bones, or fractures, especially of the hip, wrist, and spine, even from simple activities like lifting a chair or bending over.steoporosis, which means porous bone, is a disease in which the bones gradually become weak and brittle. The condition often results in broken bones, or fractures, especially of the hip, wrist, and spine, even from simple activities like lifting a chair or bending over.
Osteopenia and osteoporosis are related conditions. The difference between osteopenia and osteoporosis is that in osteopenia the bone loss is not as severe as in osteoporosis. That means someone with osteopenia is more likely to fracture a bone than someone with a normal bone density but is less likely to fracture a bone than someone with osteoporosis.