New Delhi: A large-scale observational study conducted in the United States has found no clear statistical link between the overall consumption of ultra-processed foods, such as chips and packaged snacks, and the risk of developing colorectal cancer. However, researchers strongly caution against interpreting these findings as a blanket safety approval for junk food.
The research, published in the medical journal PLOS Medicine on October 15, analysed data from 4,61,682 individuals aged between 50 and 71. Conducted by scientists at the National Cancer Institute, the “NIH-AARP Diet and Health Study” tracked the participants’ health records for an average of 18.8 years, concluding in December 2018. During this extensive follow-up period, 10,075 cases of colorectal cancer were recorded.
The researchers categorized the participants into five distinct groups based on their consumption levels of ultra-processed foods. After adjusting for various lifestyle factors, including smoking, alcohol consumption, physical activity, and family medical history, the study concluded that there was no overall direct association between high ultra-processed food intake and the onset of colorectal cancer.
Crucially, the researchers pointed out that treating all ultra-processed foods as a single category obscures distinct health impacts. While the higher consumption of certain processed items like bread and breakfast cereals showed a correlation with a lower cancer incidence, an increased intake of processed meat and reconstituted fish products was directly linked to a higher risk of colorectal cancer.
The research team emphasized the study’s limitations, noting its observational nature. This means the study can identify dietary patterns but cannot definitively prove that a specific food causes or prevents cancer. Additionally, the research relied entirely on self-reported dietary data, leaving room for inaccuracies.
Health experts have also pointed out that since the study focused exclusively on an older American demographic, its results cannot be blindly applied to the younger, diverse Indian population. Furthermore, the findings are limited to colorectal cancer and do not address the impact of packaged foods on other cancers or lifestyle diseases. Medical professionals continue to advocate for a balanced diet rich in whole grains and fibre, while actively minimizing the intake of highly processed meats.