Low fat diet may cut pancreatic cancer risk

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New Delhi: The sound of the word ‘Cancer is enough to scare anyone because there is no definite cure for it. Pancreatic cancer is one of those cancers in which the overall survival is very bleak as cases are often less sensitive to chemotherapy and radiotherapy. Dr Pradeep Jain, GI Oncosurgery, Medical Oncology, Fortis Hospital, Shalimar Bagh informs you about the connection between obesity and Pancreatic Cancer.

The best method to decrease the mortality (death rate) of these cancers is to either catch them early or prevent them happening. In view of the non-availability of any screening test and limitation of a diagnostic test, it is almost impossible to catch them very early. As dietary modification has been known for a long time to prevent cancer, it is likely to work in case of pancreatic cancer also.

Pancreatic cancer is associated with obesity and fat consumption as suggested in many epidemiological studies. Consumption of fat has been linked to pancreatic cancer not only directly but also by causing obesity. In obesity, there is a general increase in inflammatory conditions in the body which leads to the release of some chemicals (cytokines) which have an important role in the creation of pancreatic cancer.

Fat consumption (mainly saturated fats) has been shown to increase cancer of the pancreas by many observational studies in the last 2 decades. In fact a study published (which comprised of more than half-million US adults) in the journal of the National Cancer Institute in 2009 demonstrated a positive association between dietary intake of total fat, particularly from animal sources. When people taking the highest of fat compared to people taking the lowest of fat, they are 23 percent more likely to be diagnosed with pancreatic cancer (the effect was more profound when intake of saturated fat was more).

It is very difficult to comment how does fat consumption lead to pancreatic cancer, but it is likely that fat stimulates the release of an important hormone CCK (Cholecystokinin) for biliary and pancreatic secretion. And this hormone is an important instrument in the growth of pancreatic cancer cells.

In fact, in an experimental study, the antagonist of CCK, Proglumide has shown to decrease the growth of cancer cells and decrease metastasis (spread) potential of cancer.

Now this leads to an important question whether with diet modification (by reducing the content of fat) is it possible to decrease the chances of pancreatic cancer? A recent study published in Nov 2017 issue of AICR’S cancer research update) have found that older women who are overweight or obese had lowered the risk of getting pancreatic cancer by following a low-fat diet plan.

Some were arranged to eat less fat and more vegetables, fruits and grains (the intervention group) other followed their normal diet (the comparison group). After 15 years of follow up, 92 cases of pancreatic cancer were identified in the intervention group and 165 in the comparison group. This translates to a rate of 35 cases per 100,000 in the intervention group and 41 per 100,000 in the comparison group.

The low-fat diet was particularly effective in reducing pancreatic cancer risk in overweight and obese post-menopausal women. A low-fat diet was not found to lower the disease risk for women whose weight was normal.

Though this evidence support that high-fat consumption may increase the chances of pancreatic cancer and by reducing fat consumption the incidence of pancreatic cancer may decrease, but these cannot be considered as very strong evidence to support a cause and effect’. But this can be considered at least a caution to decrease fat (particularly animal fat) consumption in the diet.

Foods that are sources of saturated or trans fats are butter, margarine (stick), coconut oil, palm oil, vegetable oil and hydrogenated oil. We should motivate the general public to consume more of fiber and exercise and reduce saturated fat content from the diet.

(Dr Jain is also Laparoscopic, Gastro-Intestinal, Bariatric & Metabolic Surgery, General And Laparoscopic Surgery, Bariatric & Metabolic Surgery for Fortis Hospital, Shalimar Bagh)

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