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Simple Carbs Linked to Increased Incidence of Lung Cancer

3/19/2016

2 Comments

 
Consuming a diet with a high glycemic index, a classification of how rapidly carbohydrates elevate blood sugar levels, was independently associated with an increased risk of developing lung cancer in non-Hispanic whites, according to a new epidemiologic study from The University of Texas MD Anderson Cancer Center.

This research, published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research, represents the largest study to investigate potential links between glycemic index (GI) and lung cancer. The findings also unveil for the first time that GI was more significantly associated with lung cancer risk in particular subgroups, such as never-smokers and those diagnosed with the squamous cell carcinoma (SCC) subtype of lung cancer.

QUALITY OF CARBS HAD GREATEST IMPACT ON CANCER AMONG NON-SMOKERS 

Nationally, lung cancer is the second most common cancer in both men and women, but is by far the leading cause of cancer mortality, with over 150,000 deaths from lung cancer expected in the U.S. in 2016, according to the American Cancer Society. While tobacco use is the leading cause of lung cancer, it fails to account for all cases, particularly in those who never smoked.

Accumulating evidence suggests that dietary factors may modulate lung cancer risk, explained Xifeng Wu, M.D., Ph.D, professor, Epidemiology and senior author of the study. Diets high in fruits and vegetables may decrease risk, while increased consumption of red meat, saturated fats and dairy products have been shown to increase lung cancer risk.

Glycemic index is a measure of the quality of dietary carbohydrates, defined by how quickly blood sugar levels are raised following a meal. Previous studies have investigated associations between GI and glycemic load (GL), a related measure of carbohydrate quantity, and risk of numerous other cancers.

"Diets high in glycemic index result in higher levels of blood glucose and insulin, which promote perturbations in the insulin-like growth factors (IGFs)," said Stephanie Melkonian, postdoctoral fellow with Wu's team and lead author of the study. "Previous research suggests increased levels of IGFs are associated with increased lung cancer risk. However, the association between glycemic index and lung cancer risk was unclear."

To clarify the associations between GI, GL and lung cancer risk, the researchers surveyed 1,905 MD Anderson patients newly diagnosed with lung cancer and 2,413 healthy individuals recruited from Kelsey-Seybold clinics. Participants self-reported past dietary habits and health histories. Dietary GI and GL was determined using published food GI values, and subjects were divided into five equal groups, based on their GI and GL values.

"We observed a 49 percent increased risk of lung cancer among subjects with the highest daily GI compared to those with the lowest daily GI," said Wu. "The associations were more pronounced among subjects who were never smokers, diagnosed with squamous cell carcinoma or had less than 12 years of education."

Interestingly, GL had no significant associations with lung cancer risk. "This suggests that it is the average quality, instead of quantity, of carbohydrates consumed that may modulate lung cancer risk," said Wu.

When investigating never smokers in the study, the researchers found that those in the highest GI group were more than twice as likely to develop lung cancer as those in the lowest group. Among smokers, the risk was only elevated by 31 percent between the two groups. The relatively mild effects of a risk factor such as GI are more evident in the absence of the dominant risk factor, explained Wu.

The researchers also noted stronger associations in those diagnosed with SCC and those with lower educational levels. Participants in the highest GI group were 92 percent more likely to develop the SCC subtype compared to the lowest GI group, possibly due to the influence of elevated IGFs on SCC development.

Among those with fewer than 12 years of education, subjects in the highest GI group were 77 percent more likely to develop lung cancer than those in the lowest GI group. This contrasts with an elevated risk of only 33 percent in subjects with more than 12 years of education.

The authors note that educational level is a proxy for socioeconomic status, which has been linked with diet quality and smoking behaviors. Thus, the associations between GI and education may reflect the joint impact of poor diet and smoking on lung cancer risk.

The authors note several limitations to the study, including being limited to non-Hispanic whites. Further, this was a retrospective study, subject to errors in recall of past dietary intake, and the study did not account for diabetes, hypertension or heart disease in their subjects.

In order to validate a causal relationship between GI and lung cancer, future work must incorporate prospective cohort studies in other ethnic groups. The researchers would also like to further investigate the underlying mechanisms by which GI may influence the risk of lung and other cancers.

While specific dietary recommendations cannot be made on the basis of these results, the authors suggest limiting foods and beverages with high GI, such as white bread or bagels, corn flakes and puffed rice, for a more balanced diet and to lower the risk for lung cancer and chronic diseases. 

"The results from this study suggest that, besides maintaining healthy lifestyles, such as avoiding tobacco, limiting alcohol consumption and being physically active, reducing the consumption of foods and beverages with high glycemic index may serve as a means to lower the risk of lung cancer," said Wu.

​Sources: Science News 

2 Comments
assignmentman link
2/20/2017 04:10:44 am

This is some really good and informative article, we all eat and drink items which have high glycemic index in it and after reading what it may cause I would avoid having them..

Reply
Assignment Help Usa link
12/13/2021 01:09:53 am

I am currently working on Assignment Help Usa. I will be assigning an assignment on this topic very soon which will be based on Pure Cancer Research.

Reply



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Please note that there is only one nutritional balancing science, developed by Dr. Paul Eck. All other claims made by other practitioners, not approved by Dr. Lawrence Wilson on his site, have altered Dr. Eck's principles and as such have no in depth understanding of the science, which is very unfortunate.  

Further, altering even one aspect of a nutritional balancing program often ruins it rather completely.  This could be substituting different products that you like better, skipping an aspect of the diet or the supplements, or implementing other diets, such as GAPS OR PALEO, OR something else that people do all the time, such for example using other forms of meditation, other than what is recommended by Dr. Wilson.  In other words, using other products or diets, or meditation, conflicts with the entire program and it seriously reduces its effectiveness. Thus, nutritional balancing science is completely integrated, meaning that the sciences are used together in very unique way and should not be altered by yourself or other practitioners.  


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