Asian breasts have greater density.
Females with voluminous breasts are more likely to develop breast cancer. Among women with breast cancer, those with a higher body mass index (BMI) have larger tumors and more advanced‐stage cancers at their initial diagnosis.
Cancer can cause weight gain, which affects breast size. Conversely, women with larger breasts have difficulty feeling small breast lumps.  Therefore, they benefit from mammography.
In one study, women with the highest BMI and those wearing a brassiere cup size D (10 cm) had 50% greater cancer risk than those with the lowest BMI wearing size A (2.5 cm). For all methods of detection, the odds of regional/
Breast density contributes to later cancer detection. In a retrospective review of data collected from 15,292 women, breast density appears to be greater in Asian women and least in African American women. Age and BMI or age, bra size, and cup size can account for the reported density differences except among Asians. [2,3]
In a study of men in Brazil, Cameroon, the Czech Republic, and Namibia, individual preferences for breast size were variable, but the majority of raters preferred medium sized, followed by large sized breasts. 
Women with large bosoms may receive more attention from males in some cultures. This can cause some women to embrace higher BMI with accompanying breast volume.
The U.S. adult obesity rate reached 42.4% in 2020. This is the first time the national rate has passed the 40 percent mark. The national adult obesity rate has increased by 26% since 2008. 
Body type—particularly pear shape—is sometimes hereditary. About 5 to 10% of breast cancers and 10 to 15% of ovarian cancers are hereditary. BRCA1 and BRCA2 are two genes that help suppress cancer. A mutation in the BRCA genes can prevent them from working normally. [6–8]
Men and women have hereditary imperfections or health defects that magnify with age. This is something that is minimized by avoidance of incestual interbreeding. The offspring of people who share a large number of genes have a higher risk of passing on negative traits. This is known as autosomal recessive disorder.  Women who maintain a healthy weight with regular exercise and good food choices reduce breast cancer risks.
Either large breasts or small dense breasts can delay diagnosis. Discuss family history with your physician and get regular screening for early cancer detection.
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- Hall HI, Coates RJ, Uhler RJ, et al. Stage of breast cancer in relation to body mass index and bra cup size. Int J Cancer. 1999;82(1):23–27. doi:10.1002/(sici)1097-0215(19990702)82:1<23::aid-ijc5>3.0.co;2-e
- del Carmen MG, Halpern EF, Kopans DB, et al. Mammographic breast density and race. AJR Am J Roentgenol. 2007;188(4):1147–1150. doi:10.2214/AJR.06.0619.
- Coltman CE, Steele JR, McGhee DE. Breast volume is affected by body mass index but not age. Ergonomics. 2017 Nov;60(11):1576-1585. doi: 10.1080/00140139.2017.1330968. Epub 2017 Jun 9. PMID: 28532249.
- Havlíček J, et al. Men's preferences for women's breast size and shape in four cultures. Evolution and Human Behavior. Volume 38, Issue 2, March 2017, Pages 217-226
- The State of Obesity 2020: Better Policies for a Healthier America. tfah.org/report-details/state-of-obesity-2020/ Retrieved 6 Oct 2020
- Hsieh CC, Trichopoulos D. Breast size, handedness and breast cancer risk. Eur J Cancer. 1991;27(2):131–135. doi:10.1016/0277-5379(91)90469-t
- The Genetic Basis of Body Shape: Lessons from Mirror Twins and High-Definition Digital Photography. journalofethics.ama-assn.org/article/genetic-basis-body-shape-lessons-mirror-twins-and-high-definition-digital-photography/2010-05 Retrieved 6 Oct 2020
- Apple or Pear? Your DNA Can Determine Your Body Shape. healthline.com/dna-may-determine-where-you-store-your-body-fat Retrieved 6 Oct 2020
- Hereditary Breast and Ovarian Cancer. cdc.gov/cancer/breast/young_women/bringyourbrave/hereditary_breast_cancer/index.htm Retrieved 6 Oct 2020