Sulfur microbial diet scores linked to lung cancer incidence and mortality in 95,612 PLCO adults
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Automatic summary · not editorially reviewedIn a prospective cohort of 95,612 U.S. adults, higher sulfur microbial diet scores were associated with a 23% higher estimated hazard of lung cancer and a 19% higher hazard of dying from it; associations weakened after accounting for overall diet quality and competing causes of death. [1]
The study included 95,612 U.S. PLCO participants with an average age of 65.5 years, about 52% women, and recorded 1,561 lung cancer cases and 2,109 lung cancer-related deaths during follow-up. [1]
After adjustment, the highest SMD scores were associated with a 23% higher estimated hazard of lung cancer and a 19% higher hazard of lung cancer death compared with the lowest scores. [1]
The associations weakened after accounting for overall dietary quality and competing causes of death, leaving uncertainty about an independent contribution of the dietary pattern. [1]
PLCO cohort diet scores and lung cancer outcomes
The description reports a prospective cohort study in the U.S. PLCO Cancer Screening Trial with 95,612 adults, average age 65.5 years, about 52% women. Sulfur microbial diet (SMD) scores came from dietary questionnaires covering 25 food groups. Higher scores generally reflected more red and processed meats, French fries and high-fat dairy, and less fruit, vegetables and whole grains. During follow-up, 1,561 lung cancer cases and 2,109 lung cancer-related deaths were recorded, with mortality monitored longer. [1]
Higher SMD scores, 23% and 19% higher hazards
After adjusting for demographic, lifestyle and clinical factors, participants with the highest SMD scores had a 23% higher estimated hazard of developing lung cancer and a 19% higher hazard of dying from the disease than those with the lowest scores. The mortality association was particularly pronounced in people with a smoking history exceeding 20 pack-years. Stronger associations were also seen for squamous cell and small cell lung cancers. These are associations, not evidence that the dietary pattern causes lung cancer. [1]
Weaker associations after diet quality and competing deaths
The description states that the associations weakened after accounting for overall dietary quality and competing causes of death. This raises uncertainty about whether the sulfur microbial dietary pattern independently contributes to cancer risk. Researchers suggested that sulfur-metabolizing gut bacteria may influence inflammation and cellular health through compounds such as hydrogen sulfide; this is a proposed mechanism, not a demonstrated one. The description does not report effect estimates after these adjustments. [1]
Context & limits
This is a description of a video; the video and transcript were not reviewed. The description reports an observational prospective cohort, so associations do not show causation. The proposed gut-bacteria mechanism is not demonstrated here, and effect estimates after adjustment for diet quality and competing deaths are not given.
Based on the creator’s description; the full video and transcript were not analyzed.
Quoted passages in the original language
95,612 adults participating in the U.S.
23% higher estimated hazard of developing lung
associations weakened after accounting for overall dietary
About this video
Creator description · original textText language: English
Medical Dialogues · 3 min · Source published: 2026-10-16
Added to Harbor: 10/23/2026
Original on YouTube ↗Automatically categorized source. Creator statements are not an independent evidence review or personal medical guidance.