Pulse v bulge: grain legumes offer hope in obesity battle

Author: Fiona Halloran
Publication Date: Wednesday, 12 Jun 2013

A research student from Charles Sturt University (CSU) has discovered potential anti-obesity properties in pulses such as chickpeas, faba beans and field peas.
PhD student Mr Kyle Reynolds.Funded by the Grains Research and Development Corporation (GRDC), research by Charles Sturt University (CSU) student Mr Kyle Reynolds has found that compounds in pulses (grain legumes) appear to stop adult mouse stem cells from developing into fat cells and inhibit the absorption of fat during digestion.
Mr Reynolds said these results could now be used to determine if pulses have the potential to be used in the treatment or prevention of obesity.
"While this result doesn't completely explain the anti-obesity effects of pulses, it does go some way to providing a mechanism by which pulses may help us maintain a healthy weight," he said.
"The findings are also good news for the Australian pulse industry. If it can be further shown that pulses do have the potential to fight obesity the demand for pulses is likely to increase, boosting the value of the industry and its products. That can only be a good thing for Australian growers."
During his research at CSU in Wagga Wagga, Mr Reynolds extracted compounds from chickpeas, faba beans and field peas and incubated them with adult mouse stem cells that were being converted to fat cells.
The pulse extracts appeared to inhibit the process of fat cell development (adipogenesis) by turning off a key gene in this process, suggesting that pulses may contain compounds that interact with genes to provide health benefits.
Mr Reynolds also identified that field pea extracts contain compounds that have the ability to inhibit the activity of pancreatic lipase – the enzyme secreted by the pancreas to break down fats in the intestinal tract during digestion.
To provide further evidence, whole animal experiments would be required to determine how compounds from pulse extracts are metabolised in the body.
Mr Reynolds said the potential of natural products in the treatment of obesity was largely unexplored, but recent studies indicated that the inhibition of the processes that lead to fat cell development were associated with the bioactivity of phenolic compounds found in plants and vegetables. Phenolic compounds have also been associated with anti-cancer and anti-oxidant activities.
Previous research has shown that other members of the legume family – including garden pea, white kidney bean and fenugreek – exhibited anti-obesity properties. "This provided reason to believe that other related species may exhibit similar anti-obesity activities," Mr Reynolds said.
After demonstrating the anti-adipogenic and anti-obesity of the pulse extracts, Mr Reynolds said the next logical step would be to isolate fractions of the pulse extracts to identify the specific compounds that are responsible for the anti-adipogenic and anti-obesity activities.
"These compounds could then be used in the preparation of pharmaceuticals, or in the development of value-added food products, for the treatment or prevention of obesity," he said.
Mr Reynolds said it was extracts from the seed of pulses that had shown anti-obesity properties during his research, so it would be interesting for experiments to be undertaken on extracts from pulse hulls to determine if they contain similar properties.
"Hulls are normally regarded as a waste product, but if it could be shown that the hulls contain compounds that significantly inhibit the process of adipogenic differentiation, they could potentially be used within the food production industry through the development of value-added food products," he said.
To follow on from Mr Reynolds' investigations, researchers at CSU will now look at extracts from other grains to see if similar results can be obtained.
In the meantime, Mr Reynolds has obtained a PhD scholarship from the Graham Centre for Agricultural Innovation - an alliance between CSU and NSW DPI - and has recently commenced his PhD through CSU, based at CSIRO in Canberra.
Mr Reynolds is one of two Honours students training in the area of pulse quality research at CSU through a GRDC-funded capacity building program specifically for the Australian pulse industry.
Associate Professor in Food Science Chris Blanchard, from the School of Biomedical Sciences at CSU in Wagga Wagga, leads the project and collaborates with Dr Jenny Wood (NSW DPI) and CSU's Dr Padraig Strappe and Dr Hassan Obeid.
Associate Professor Chris Blanchard.The second student funded under this project, Ms Michelle Low, is focused on measuring the Associate Professor Chris Blanchard.antioxidant properties of a range of pulse-based products and assessing the impact of cultural cooking practices on antioxidant levels.
Associate Professor Blanchard said the GRDC-funded program had been established as a means of addressing the lack of suitably qualified people and building capacity within the Australian pulse industry.


Media contact: Fiona Halloran, (02) 6933 2207

Media Note:
Mr Kyle Reynolds is a PhD student at CSU. He is based at CSIRO in Canberra on mobile 0438 334753. Associate Professor Chris Blanchard is based at the School of Biomedical Sciences at CSU in Wagga Wagga. For media queries contact Ms Sharon Watt from Porter Novelli on mobile 0409 675100.