Labels shape public perceptions of disease; ‘obesity’ epitomizes this
Another expert championing the need for a name that better reflects the definition – whatever that turns out to be – is Margaret Steele, PhD, School of Public Health, University College Cork (Ireland), who, according to her university webpage, has a special interest in “ ‘fatness’ as a cultural, social and political phenomenon.”
She believes that labels, including “obesity,” have a pivotal role in shaping public perceptions. In our digital, information-rich age, the boundaries of medicine and society overlap, with public perception shaping decisions of a medical nature as never before. But with this comes controversy and division – obesity management being a case in point.
Specifically, the word “obesity” is too widely associated with negative connotations, she says, and therefore she welcomes the dialogue around redefining and renaming it. Despite wide general support for a name and definition that reflects adiposity, due to its central physiologic role in the complications of obesity, Dr. Steele believes that the “effects on adipose tissue are downstream of brain issues and the food environment,” and she wants to see more attention brought to this.
Referring to most Westernized societies, she describes how people who grew up in times of food scarcity, before processed foods became widely available, have a different taste profile from those who grew up afterwards. “Growing up in 1940s and ‘50s Ireland, people recall how they remember getting an orange as a treat at Christmas, because the idea that you could have food all year-round – any fruit and veg that you want, when you want it – just wasn’t there.”
By comparison, societal changes leading to more financial and time pressure in later decades meant that fast, high-fat, high-sugar, and processed foods became more desirable, she points out. “Most young children now recognize the company name, and even the specific fast-food brand [they like], before they know their alphabet.”
The current environment has cultivated “a very different physical reaction to foods, maybe a different kind of emotional response,” she believes, highlighting the tightly woven relationship between obesity, society, mental health, and food options.
Dr. Steele wants to stimulate a conversation about the term used to describe individuals, conventionally described as ‘”obese” or using the word “obesity.” “We’re thinking in terms of maybe chronic appetite, chronic food intake, or dietary intake dysregulation.”
Changing medical terminology when it has become useless or harmful is not new, she argues, with co-author, Francis Finucane, MD, consultant endocrinologist at Galway University Hospitals, Ireland, in a recent paper on the subject.
“In the 20th century, the terms ‘feeble-minded’ and ‘moron’ had become used in a pejorative way in the wider culture and were dropped from medical usage,” Dr. Steele points out. She adds that changing the term “obesity” can facilitate pursuit of the strategic goals of clinical medicine “without causing needless controversy with those who, given their own goals and contexts, understand body mass index or body weight in a radically different way.”
Obesity: Disease, risk factor, or both?
Dr. Rubino stresses that prior to any renaming, there is a need to establish and define the essential components and characteristics of the disease of obesity. “This question is at the core of our Commission, and it is not an easy conversation to have.” He further explains that the struggle with the current definition of obesity, and the way it is conceived, is largely centered on it still being considered a risk factor for something else.
Disease is characterized by three things, says Dr. Rubino. These comprise the phenomenon of having a pathogenic cause, leading to pathophysiologic alterations (of the organs), causing clinical manifestations.
He adds that obesity is currently described by what it can cause – for example, type 2 diabetes, cancer, or hypertension. “Each of these things have their own clinical manifestations but obesity doesn’t. [As a disease], we don’t have a definition of the clinical manifestations of obesity other than excess adiposity.”
“If we use BMI, this does not predict excess adiposity, nor does it determine a disease here and now. There is no disease without an illness, which is the clinical manifestation, and the perception by the patient of it being an illness,” explains Dr. Rubino, pointing out that the Lancet Commission is filling this gap in knowledge by asking, “If obesity is an illness, then what does it look like?”
He adds that waist circumference probably provides a better measure than BMI in directly indicating the abnormal distribution of adiposity, known to be associated with poor cardiometabolic outcomes, “but it doesn’t tell you if you have an illness here and now – only that someone is at risk of developing cardiovascular disease in the future. Most people with some excess fat around the waist are perfectly functional and don’t feel ill.”
He also explains that confusion persists around whether obesity – or excess adiposity – is a risk factor for or a symptom of another disease. “The picture is blurred, and we do not know how to discriminate between these. We only have one name, and it applies to all those things, and we have one criterion – BMI – to diagnose it!”
Dr. Rubino adds, “So, what defines it? Is it diabetes? No, because that is another disease. You don’t define a disease by another. It has to stand on its own.”
Recently, the American Medical Association advised that BMI now be used in conjunction with other valid measures of risk such as, but not limited to, measurements of visceral fat, body adiposity index, body composition, relative fat mass, waist circumference, and genetic/metabolic factors.
Aayush Visaria, MD, an internal medicine resident at Rutgers University, New Brunswick, New Jersey, agrees that a new name might help change public perception of obesity for the better. A study he presented at the 2023 Endocrine Society Meeting found that BMI “vastly underestimates” obesity.
He agrees with Dr. Rubino that the challenge lies in the lack of precise understanding of the mechanisms driving obesity: “It’s multifactorial, so not just appetite or food intake. Putting this into one phrase is difficult.”
However, if a new term can incorporate the many facets of the disease, “overall, it’ll reduce stigma because we’ll start to think about obesity as a disease process, not a personal thing with blame attached,” says Dr. Visaria.
But simultaneously, he expresses caution around possible negative connotations associated with the classification of obesity as a disease. Dr. Steele also reflects on this risk, highlighting that medicalizing body size can be counterproductive in feeding into weight stigma and fatphobia.
“Medicalizing obesity can be discouraging rather than empowering, but by specifying more clearly that we’re talking about a specific set of interrelated metabolic conditions, it would make it much clearer, and that ... this isn’t about making people skinny, it isn’t about an aesthetic thing,” Dr. Steele observes.