The original text of this sentence is a study published in the British Journal of Cancer in 2008. But unlike the rumor, two important CYP 1A2* 1F genes were actually mentioned in the related papers published in this study. With them, the influence of coffee intake and breast size is different.
It is mentioned that during the period from 1996 to 2006, the researchers investigated the living habits of 269 healthy women, detected the genotype of CYP 1A2* 1F, collected their chest circumference data, and made statistical analysis on these data. It was found that subjects with cyp 1a 2 * 1F C- allele had smaller breasts than girls who drank a lot of coffee every day. However, the coffee intake of subjects with CYP 1A2* 1F A/A gene had little correlation with breast size.
Scientists say that as a result of this investigation, only a part of people's coffee intake is found to be related to chest size. Experts infer that drinking coffee every day may reduce the chest circumference, because the absorption and metabolism of caffeine in the human body may be different, which may cause different metabolic reactions in some pathological conditions of the body, leading to smaller breasts.
Therefore, women who like to drink coffee don't have to worry that their breasts will get smaller after drinking coffee. This is just a possibility. Scientific research also found that caffeine also has a beneficial side, which helps to reduce the risk of breast cancer in women. Another surprising result is that although caffeine may shrink women's breasts, men who drink coffee will have another result, and their "breasts" may increase.