In a new study, researchers found that overweight and obese people who lose weight may reduce their chances of developing colorectal adenoma—a type of benign growth or polyp in the colon or rectum that could lead to colorectal cancer.
Colorectal cancer is the third most common type of cancer and the third leading cause of death from cancer among men and women in the United States.
Over the past 30 years, obesity has increased in the United States and worldwide, leading to the increased development of many chronic diseases.
Obesity is a known risk factor for colorectal adenoma and colorectal cancer.
Doctors recommend weight loss for overweight and obese people commonly.
Although weight loss is thought to have some beneficial health effects, whether losing weight can reduce the chance of developing colorectal adenoma has been an open question.
In the study, the team assessed weight change (including both weight gain and weight loss) over three periods of adulthood in relation to colorectal adenoma using self-reported weight data from a large clinical trial.
The trial enrolled 154,942 men and women in the United States ages 55 to 74 from 1993 to 2001 to evaluate the effectiveness of different screening approaches in preventing death from various cancers.
This current study used data from participants in the screening arm of the trial, who received a colorectal cancer screening test at baseline and again 3 or 5 years later.
The team found that, compared to a stable weight, weight loss in adulthood (defined as loss greater than or equal to 1.1 pounds per 5 years) was associated with a 46% reduced risk for colorectal adenoma.
This was particularly true among adults who were initially overweight or obese.
The investigators also reported that weight gain in adulthood was associated with an increased chance of adenoma, particularly for weight gain greater than 6.6 pounds over 5 years.
Findings for weight loss and weight gain appeared stronger among men than women.
The researchers believe that the findings suggest the importance of healthy weight maintenance throughout adulthood in preventing colorectal adenoma.
Additionally, adults who are overweight or obese may be able to reduce their risk of developing colorectal adenoma by losing weight.
These findings suggest that avoiding weight gain in adulthood may help lower someone’s chance of developing a pre-cancerous growth called a colorectal adenoma, which may, in turn, reduce the risk of developing colorectal cancer.
If you care about weight loss, please read studies about diet that can effectively help you lose weight and reduce cholesterol, and ‘gamechanger’ drug that could treat obesity by cutting body weight by 20%.
For more information about colon cancer, please see recent studies about how to protect yourself from colon cancer, and results showing this vitamin level in the body linked to your colon cancer risk.
The study is published in JNCI Cancer Spectrum and was conducted by Kathryn Hughes Barry et al.
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