Dietary Glycemic Load and Lung Cancer Risk

Dietary Glycemic Load and Lung Cancer Risk

Dietary patterns that influence blood sugar and insulin levels have been increasingly studied in relation to cancer risk. Melkonian and colleagues examined whether diets with a high glycemic index (GI) or glycemic load (GL) were associated with lung cancer risk in non-Hispanic White adults, with particular attention to differences by smoking status.
This population-based case–control study compared dietary intake in individuals diagnosed with lung cancer to cancer-free controls. Glycemic index reflects how quickly carbohydrates raise blood glucose, while glycemic load accounts for both carbohydrate quality and quantity. The researchers evaluated whether higher GI or GL diets were associated with increased lung cancer risk after adjusting for smoking history, total energy intake, and other lifestyle factors.
The study found that higher dietary glycemic load, but not glycemic index alone, was associated with an increased risk of lung cancer, particularly among never-smokers. This suggests that repeated post-meal spikes in blood glucose and insulin may play a role in lung cancer development independent of tobacco exposure. Potential mechanisms include insulin and insulin-like growth factor signaling, which can promote cell proliferation and inhibit apoptosis.
Although this observational study cannot prove causation, it provides important evidence that metabolic factors related to diet may influence lung cancer risk, especially in individuals without a smoking history. These findings support broader research into dietary patterns and metabolic health as modifiable factors in cancer prevention strategies.

Reference:

Melkonian SC, Daniel CR, Ye Y, Pierzynski JA, Roth JA, Wu X. Glycemic index, glycemic load, and lung cancer risk in non-Hispanic Whites. Cancer Epidemiol Biomarkers Prev. 2016;25(3):532–539. doi:10.1158/1055-9965.EPI-15-0765. PMID: 26944871; PMCID: PMC4780226.