The non-functional ABCC11 allele is predominant among East Asians (80–95%), but very low in other ancestral groups (0–3%).  Most of the world's population have the gene that codes for the wet-type earwax and normal body odor; however, East Asians are genetically predisposed for the allele associated with the dry-type earwax and a reduction in body odor.    East Asians ( Chinese , Koreans , and Japanese ) have fewer apocrine sweat glands compared to people of other descent, making East Asians less prone to body odor.   The reduction in body odor and sweating may be due to adaptation to colder climates by their ancient Northeast Asian ancestors. 
The most common estimation of IBW is by the Devine formula; other models exist and have been noted to give similar results.  Other methods used in estimating the ideal body weight are body mass index and the Hamwi method. The IBW is not the perfect fat measurement as it does not show the fat or muscle percentage in one's body. For example, athletes' results show that they are overweight when they are actually very fit and healthy. Machines like the dual-energy X-ray absorptiometry (DXA) can accurately measure the percentage and weight of (fat, muscle, bone) in a body.
These are among the earliest clinical studies using microbiome data to study its role in specific illnesses. NIH has funded many more medical studies using HMP data and techniques, including the role of the gut microbiome in Crohn's disease, ulcerative colitis and esophageal cancer; skin microbiome in psoriasis, atopic dermatitis and immunodeficiency; urogenital microbiome in reproductive and sexual history and circumcision; and a number of childhood disorders, including pediatric abdominal pain, intestinal inflammation, and a severe condition in premature infants in which the intestine actually dies.