Periodontosis is an obsolete term that was used to describe what was once thought to be certain type of unique and distinguishable chronic periodontal disease that manifested as degenerative bony changes without concomitant inflammation. Although utilized for more than 50 years, the term has since been dropped in favor of a more contemporary disease classification for periodontal disease. Described by Gottlieb as a "diffuse atrophy of the alveolar bone," the term periodontosis was later applied and it gained acceptance as a disease entity,  being defined as:

"a degenerative, noninflammatory destruction of the periodontium, originating in one or more of the periodontal structures and characterized by migrating and loosening of the teeth in the presence or absence of secondary epithelial proliferation and pocket formation or secondary gingival disease. "Noted as a rare disease, periodontosis was said to have been seen primarily in young patients. And despite being defined as being a "noninflammatory destruction of the periodontium," almost all cases did exhibit varying degrees of gingival inflammation. References


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Having low dietary energy from excessive exercise or dietary restrictions leaves too little energy for the body to carry out normal functions such as maintaining a regular menstrual cycle or healthy bone density. Amenorrhea
Amenorrhea, defined as the cessation of a woman’s menstrual cycle for more than three months, is the second disorder in the triad. Weight fluctuations from dietary restrictions and/or excessive exercise affect the hypothalamus’s output of gonadotropic hormones. Gonadotropic hormones “stimulate growth of the gonads and the secretion of sex hormones.”  (e.g. gonadotropin-releasing hormone, lutenizing hormone and follicle stimulating hormone.) These gonadotropic hormones play a role in stimulating estrogen release from the ovaries. Without estrogen release, the menstrual cycle is disrupted. Exercising intensely and not eating enough calories can lead to decreases in estrogen, the hormone that helps to regulate the menstrual cycle. As a result, periods may become irregular or stop altogether.There are two types of amenorrhea. A woman who has been having her period and then stops menstruating for ninety days or more is said to have secondary amenorrhea. In the case of RED-S, the majority of secondary amenorrhea cases are attributed to functional hypothalamic amenorrhea (FHA), an adaptive mechanism to preserve energy for survival and vital processes rather than reproduction when energy balance is low. Primary amenorrhea is characterized by delayed menarche (the onset of menses during puberty). Delayed menarche may be associated with delay of the development of secondary sexual characteristics.