Osteoporosis is the most known bone disease of the western world, and it is being expressed by general bone mass atrophy, meaning, a reduction of the inorganic ingredients (calcium and phosphorus) and the organic ingredients (the collagen protein) of the bone, which is why its folk name "calcium loss" is not precise.
The process begins among both men and women after their mid-30's, but it is being especially increased among women after their menstrual cycle ceases (the estrogen hormone has a crucial role in delaying bone atrophy process).
The bone atrophy process is complex and has many factors (genetic, hormonal, nutritional, body structure and related diseases).
High caffeine and food salt consumption might increase calcium secretion, therefore it is recommended to avoid the consumption of those ingredients, likewise, some people assume that an increased amount of food proteins, also increases calcium secretion in urine, although not all of the experts agree on that.
A regular supply of calcium, vitamin D and magnesium might stop the bone atrophy process and help building it.