Public Release: 

How does the environment affect obesity?

Research looks at brown adipose tissue (BAT)

McMaster University

Hamilton, ON (May 2, 2016) - How the environment impacts obesity and other problems such as diabetes and liver disease is the focus for a McMaster University research team which is receiving a large federal grant today.

Drs. Gregory Steinberg and Katherine Morrison lead the team, which will receive $2 million. They are the co-directors of the Metabolism and Childhood (MAC-Obesity) Research Program of McMaster and Hamilton Health Sciences.

More than five million Canadians have the chronic interrelated diseases of obesity, non-alcoholic fatty liver disease (NAFLD) and type-2 diabetes, and those numbers are rapidly growing, says Steinberg.

"These diseases have become much more prevalent in the last decade and reduce quality of life and life expectancy. However, the reasons why incidence rates have increased so dramatically are not fully understood," says Steinberg. "Clearly we need to do something about it, and this grant is a significant step towards solving this crisis."

Brown adipose tissue (BAT), widely known as brown fat, is present in large amounts in infants and then decreases as humans age. BAT acts as the body's furnace to burn calories. Activating or "turning on" brown fat has shown to reverse obesity and may be a viable therapy for treating type-2 diabetes, but the ability to turn on BAT in individuals with obesity or type-2 diabetes is reduced.

With the newly-announced funds, the MAC-Obesity team will be conducting further studies on brown fat.

"We will be looking at the environmental factors affecting BAT," says Morrison. "A lot of people focus on the appetite side of the equation, but we're focusing on how food is used, and what environmental agents may influence this process."

Steinberg and Morrison's team will be examining how agricultural and food processing practices may affect brown fat activity directly or indirectly. Research will look at how toxicants such as pesticides or herbicides could alter BAT in individuals in addition to food ingredients such as artificial sweeteners or high fructose corn syrups, says Steinberg.

The studies will help develop new strategies to enhance BAT activity that may be effective for treating and preventing obesity, NAFLD and type-2 diabetes, says Morrison.

"These funds have a critical role in bringing together a team that includes health care professionals working with adults and children, pre-clinical scientists, microbiologists, bioinformatics experts and imaging experts. We will incorporate cutting-edge technologies to make new discoveries of how brown adipose tissue and the gut microbiome interact to influence health."

The funding is being provided by the Canadian Institutes for Health Research (CIHR) signature initiative on Environments and Health, which supports research focused on understanding how the environment contributes to health and disease and improving overall health.

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