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Research Question:
The association between the intake of zinc and the chance of getting cancer of the gastrointestinal tract is mentioned in several epidemiological studies, however the results were controversial. It was therefore carried out this review article.

Lowers eating zinc the chance of getting cancer of the gastrointestinal tract?

Study Design:
This overview article contained 19 studies with approximately 400,000 participants.

Results and conclusions:
The researchers found that a high zinc intake via food compared to a low, the chance of getting cancer of the gastro-intestinal tract significantly with 18% [95% CI = 0.70-0.96, p = 0.013] reduced. Significant is, there is a link at a 95% reliability.

The researchers found that a high zinc intake via food compared to a low, the chance of getting colon cancer significantly with 20% [pooled RR = 0.80, 95% CI = 0.70-0.92, p = 0.002] reduced. Significant is, there is a link at a 95% reliability.

The researchers found that a high zinc intake via food compared to a low, the chance of getting both stomach cancer as esophageal cancer among Asians, but not among Europeans and Americans reduced. 

The researchers concluded that eating a lot of zinc the chance of getting cancer of the gastrointestinal tract, especially colon cancer reduced.

Original title:
Association between zinc intake and risk of digestive tract cancers: a systematic review and meta-analysis by Li P, Xu J, [...], Wu Y.

Link:
http://www.ncbi.nlm.nih.gov/pubmed/24148607

Additional information about El Mondo:
Find here more studies on colon cancer and zinc.