Obesity and cancer third most important risk factor for cancer in the United States, just behind tobacco and diet (see Figure). Obesity is the source of about 15% of all preventable cancers. In 2018, Chinese researchers performed a systematic review and comprehensive quantitative meta‐analysis of cohort studies reporting body mass index (BMI) and the risk of 23 cancer types, providing epidemiological evidence supporting the association between BMI and cancer risk. The strongest positive association between BMI and cancer risk was found among patients in North America. The mechanisms by which obesity may increase the risk of cancer are not well understood, but it
Tropical rain belt the lower atmosphere, the abundant moisture from the tropics loses the ability to be stored in the atmosphere. As a result, the excess moisture that cannot be held by the colder air is then turned into thunderstorms and rain showers. These thunderstorms and rain showers are usually located along the equator, but they will extend out to the Tropic of Cancer, which is the 23.5 north latitude, as well as the Tropic of Capricorn, which is the 23.5 south latitude. It is largely a manifestation of the ITCZ (pronounced "itch"). The tropical rain belt lies in the southern hemisphere of