Understanding Obesity
'Eat less, move more.' You've probably heard this mantra for weight loss success repeated many times. Yet despite our best intentions to trim calories and walk around the block, obesity has reached epidemic proportions in the United States.
Obesity has more than doubled among U.S. children ages 2 through 5 during the past 30 years, and has more than tripled among tweens and teens. More than one-third of adults in the United States are obese. The consequences of this epidemic are far-reaching. Tens of millions of Americans face an increased risk of type 2 diabetes, heart disease, high blood pressure, certain cancers, osteoarthritis, and other serious health problems associated with excess body fat. In addition to the burden of obesity on the healthcare system, there is the burden of discrimination and stigma at the personal level. As anyone who has cursed their bathroom scale can tell you, obesity seems to be a complex disorder that defies the conventional wisdom regarding calories in and calories out.
Common Fund Obesity Research
Several researchers supported by the NIH Common Fund are striving to better understand the causes of obesity. These exceptional individuals, who are funded through the High Risk-High Reward program, are being encouraged to pursue innovative approaches and to follow them in expected or unexpected directions. By bringing their unique perspectives and abilities to bear on this important health challenge, these visionary scientists may transform how we prevent and treat obesity and obesity-related conditions in the future.
Julie Parsonnet, M.D., Stanford University
Dr. Parsonnet is examining the link between the increasing rate of childhood obesity and decreasing rate of childhood infections. While these trends may be coincidental, she postulates there is a cause and effect relationship.
Over the last 40 years there has been a multifold increase in obesity in American children. During this time, childhood infections have been declining due to changes in family size, improvements in hygiene, the addition of new vaccines, and other preventive health measures. Dr. Parsonnet hypothesizes that frequent, chronic and/or severe prenatal and childhood infections prevent weight gain, overweight and obesity in children. She additionally hypothesizes that early acquisition of specific chronic infections, such as herpes viruses and Helicobacter pylori infection, protect against obesity.
Infections influence a number of critical factors that affect weight gain, including energy expenditure, appetite, and fat cell growth and metabolism. Dr. Parsonnet and her team are monitoring children from conception through at least five years of age, and ultimately through adolescence and adulthood, to determine how infectious diseases influence body weight. Infection in the children is being measured by the monitoring and reporting of daily symptoms and signs by parents, and by following the development of detectable antibodies against a number of microbes. The mechanisms by which infection might alter weight gain are being explored by measuring resting energy expenditure and levels of cell signaling proteins that are released by fat cells and other cell types. Dr. Parsonnet's goal is to determine whether a significant proportion of the increase in weight in U.S. children over the last 40 years is related to children leading healthy, uninfected lives.
Learn more about Dr. Parsonnet's research:
Kevin Niswender, M.D., Ph.D. and Aurelio Galli, Ph.D., Vanderbilt University School of Medicine
Dr. Niswender, a specialist in metabolism and diabetes, and Dr. Galli, a biophysicist who studies drug addiction, have teamed up to explore the potential molecular link between how the body processes sugars and mental illness. These researchers aim to transform the approach to studying obesity by analyzing parallel changes in insulin and dopamine signaling.
Drs. Niswender and Galli hypothesize that consumption of high-fat, high-sugar foods leads to disruptions in how insulin works in our brains. This disruption could lead to impaired dopamine signaling, which in turn might causing over-consumption of foods by altering the brain's 'reward' circuitry.
Utilizing a rodent model of diet-induced obesity, they are measuring insulin action and dopamine signaling in the brain. Armed with an array of cutting-edge tools, they seek to define the specific regions of the brain that are involved in the pathology of obesity, as well as the molecular mechanisms involved in changes in these regions. Subsequently, they hope to correct the pathological alterations. By understanding how changes in insulin and dopamine signaling cause changes in feeding behavior, their findings could lead to the development of new therapeutic interventions to treat obesity and associated diseases.
Learn more about the research of Dr. Niswender and Dr. Galli:
Martin J. Blaser, M.D., New York University School of Medicine
Trillions of microorganisms, including bacteria such as Helicobacter pylori, have resided in the guts of humans for tens of thousands of years. Dr. Blaser speculates that over time there have been changes in the composition of these microbes due to modernization, and that these changes may be playing a role in the increasing incidence of obesity.
Dr. Blaser hypothesizes that common antibiotic treatments may be unintentionally causing changes in the composition of the bacterial populations that normally live in our stomach and intestines, and that these changes are then inherited by subsequent generations. He is examining the relationships among the presence of microbes in the digestive system of mothers and children; the physiology of gastric hormones, inflammation, and immunity; the hormonal and metabolic changes that occur as a result of changes in antibiotic treatment; and the incidence of childhood obesity. Dr. Blaser aims to better understand the importance of the microbes that live within us and how the presence or absence of these microorganisms may lead to conditions such as obesity.
Learn more about Dr. Blaser's research:
Learn More About NIH Obesity Research And Resources
NIH obesity research
Through its research mission, the NIH seeks to identify genetic, behavioral, and environmental causes of obesity; to understand how obesity leads to type 2 diabetes, cardiovascular disease, and other serious health problems; and to build on basic and clinical research findings to develop and study innovative prevention and treatment strategies.
Learn more at: http://obesityresearch.nih.gov/
National Collaborative on Childhood Obesity Research (NCCOR)
The NIH, the Centers for Disease Control and Prevention (CDC), and the Robert Wood Johnson Foundation together launched the NCCOR to address the problem of childhood obesity in America.
To learn more, please visit: www.nccor.org
NIH obesity research funding opportunities
Obesity-related research solicitations that are currently open for submission of applications for funding are listed at: http://obesityresearch.nih.gov/funding/funding.htm. Detailed information, including names of individuals to contact with questions, is provided through the links associated with each solicitation.
Clinical trials
ClinicalTrials.gov is a registry of federally and privately supported clinical trials conducted in the United States and around the world. ClinicalTrials.gov gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details. This information should be used in conjunction with advice from health care professionals.
To find clinical trials, visit www.clinicaltrials.gov/ and search for terms such as "obesity" and "childhood obesity".
Learn more about obesity from MedlinePlus
Scan overviews, multimedia, references and more to learn about the latest research and news on topics related to obesity at http://www.nlm.nih.gov/medlineplus/obesity.aspx.
Training opportunities
Explore research and training opportunities on the NIH campus ranging from summer programs for high school students to employment for postdoctoral scientists (intramural), as well as learn about NIH-supported pre-doctoral and postdoctoral training opportunities at universities and other institutions across.
Learn more at
http://www.nih.gov/Training.htm.