In contrast, for all but two of the 18 non-obesity related cancers, rates either stabilized or declined in successive younger birth cohorts. Kidney cancer had the sharpest annual increase for young Americans: 6.23% between 1995 and 2014.
Millennials - people born in the 1980s or '90s - have double the risk of some types of cancers compared with the rates baby boomers experienced at that age, according to the American Cancer Society.
Those between the ages of 30 and 34 saw a 2.47 percent increase, while those between the ages of 35 and 39 saw a 1.31 percent increase.
A new study finds rates are increasing for six of 12 cancers related to obesity in younger adults in the United States, with steeper increases in progressively younger ages and successively younger generations.
The research suggests that the rapid rise in obesity over the last few decades may account for the observed trend, with "younger generations worldwide experiencing an earlier and longer exposure to the dangers of extra weight". "But I think the overall picture is that most of these obesity-related cancers are increasing". Especially striking was the rising rate of kidney cancers.
A further 19,200 inactivity-related cancers could also potentially be avoided if every Australian adult undertook at least five hours of moderate intensity physical activity per week.
The average annual percentage change in pancreatic cancer incidence increased with decreasing age, from 0.77% for those aged between 45 and 49 to 4.34% for those aged between 25 and 29.
The findings of the reseach show that how obesity has shifted certain cancers to younger age groups and intensified cellular mechanisms promoting the diseases.
The survey revealed that the obesity-linked cancers in young adults have been on the rise between 1995 and 2015, affecting both women and men, nearly equally. About two out of three cases occurred in adults who are 50 to 74 years old.
Mirroring the decades-long increase in obesity rates in the USA, cancers that are thought to be driven at least in part by excess weight are also on the rise among people under age 50, a new study suggests. Other factors, like the environment and genetics, might also play roles.
Overall, the findings could reflect the obesity epidemic of the past 40 years. British obesity rates are not far behind the US. Obesity is now one of the most preventable causes of cancer in both the United States and the UK - around 1 in 12 cases in the U.S. are caused by excess weight and more than 1 in 20 in the UK.
"The quality of the American diet has worsened in recent decades", concluded the study's leading author Hyuna Sung.
Currently, less than half of primary care physicians in the U.S. regularly measure the body-mass index (BMI) of their patients. Not everyone who gets these cancers is overweight either, and not everyone who is obese will necessarily get these cancers. They found a disturbing trend among adults age 24 to 49. However, screening is less common in younger adults, while increases in cancer incidence were still greater.
The link between obesity and cancer is of growing concern.