Why Some Cancers Are Rising in Younger Adults
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Several cancers are being diagnosed more often before age 50, but the patterns differ by cancer type, geography, sex, and birth cohort. In this clip from Dr. Rhonda Patrick's appearance on the Jack Neel Podcast, she explains that the trend likely reflects several interacting influences. Excess body weight, alcohol, processed meat, low-fiber diets, inactivity, infections, inherited risk, reproductive factors, environmental exposures, and changes in detection may all contribute. [1]
Diet is one modifiable part of this larger picture. Higher fiber and whole-grain intake is consistently associated with lower colorectal-cancer risk. A meta-analysis estimated about a 10 percent lower relative risk for each additional 10 grams of fiber consumed per day. Fiber can increase stool bulk, shorten transit time, and support microbial production of short-chain fatty acids. Useful sources include legumes, intact whole grains, nuts, seeds, vegetables, and whole fruits. [2]
Processed meat and alcohol are also linked to selected cancers, including colorectal and breast cancer. These findings support a broad prevention pattern rather than one isolated dietary rule. Practical steps include avoiding tobacco, minimizing alcohol, maintaining a healthy weight, eating varied plant foods, exercising, using recommended vaccines and sun protection, knowing family history, and following age- and risk-based screening guidance. [3] [4]
This clip is excerpted, with permission, from Dr. Rhonda Patrick's appearance on the Jack Neel Podcast. Thank you to Jack Neel for allowing us to share it.
- ^ 10.1038/s41571-022-00672-8
- ^ 10.1136/bmj.d6617
- ^ 10.1001/jamanetworkopen.2020.37341
- ^ Sun Q; Xie W; Wang Y; Chong F; Song M; Li T, et al. (2020). Alcohol Consumption by Beverage Type and Risk of Breast Cancer: A Dose-Response Meta-Analysis of Prospective Cohort Studies. Alcohol Alcohol 55, 3.
Jack Neel: Why are some cancers occurring more often in younger adults?
Dr. Rhonda Patrick: Several cancers are being diagnosed more often before age 50, but the pattern differs by cancer, population, and time period. Researchers have not identified one cause. Excess body weight, alcohol, processed meat, low-fiber diets, inactivity, infections, inherited risk, reproductive factors, environmental exposures, and changes in detection may contribute.
Excess body weight is associated with 13 cancer types. A CDC analysis found that these obesity-associated cancer types made up about 40 percent of U.S. cancer diagnoses in 2014. That does not mean excess body weight caused 40 percent of all cancers.
Plausible pathways include chronic inflammation, oxidative stress, insulin and IGF-1 signaling, sex hormones, and altered immune function. Their importance differs by cancer and by person. Cancer development is complex, and there is no universal five-to-six-year timeline from one damaged cell to a detectable tumor.
Diet is one modifiable part of risk. Processed meat raises colorectal-cancer risk, and alcohol raises the risk of breast, colorectal, and several other cancers. Ultra-processed-food evidence is mainly observational and does not prove that refined sugar alone causes cancer.
Higher fiber and whole-grain intake is consistently associated with lower colorectal-cancer risk. A meta-analysis estimated about 10 percent lower risk for each additional 10 grams of fiber per day. Fiber can increase stool bulk, shorten transit time, and support microbial fermentation. These pathways are plausible, but they do not guarantee prevention.
Solubility, viscosity, and fermentability are different fiber properties. Some fibers form a viscous gel, while other fibers are readily fermented. Human studies have not shown that ordinary dietary fiber blocks microplastic or nanoplastic absorption. The proposed chain from fiber to short-chain fatty acids, regulatory T cells, cytotoxic T cells, and cancer prevention remains largely mechanistic and preclinical.
Jack Neel: What foods provide fiber?
Dr. Rhonda Patrick: Useful sources include legumes, intact whole grains, nuts, seeds, vegetables, and whole fruits. The U.S. dietary reference is 14 grams per 1,000 calories. Daily targets vary by age, sex, and energy intake. Increase fiber gradually and drink adequate fluid.
Cancer risk reduction also includes avoiding tobacco, minimizing alcohol, maintaining a healthy weight without stigma, exercising, using recommended vaccines and sun protection, knowing family history, and following age- and risk-based screening. These steps lower risk, but they cannot guarantee prevention.
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