People Judge Weight Loss More Harshly When GLP-1 Drugs Are Used, Study Finds

Key Takeaways:

• People using GLP-1 and other anti-obesity medications were consistently judged more negatively than those losing weight through diet and exercise alone.
  
• Researchers found that anti-obesity medication users were perceived as putting in less effort and were therefore viewed as less moral, competent, warm, and deserving of their success.
  
• The findings suggest that stigma surrounding obesity treatment may discourage people from seeking effective medical care and reinforce harmful misconceptions about obesity and weight loss.
  
  
  

Study explores social attitudes toward weight loss medication

A recent study published in Scientific Reports has found that people who lose weight using anti-obesity medications (AOMs), including glucagon-like peptide-1 (GLP-1) receptor agonists, are often judged more harshly than those who lose weight through diet and exercise alone.

The research examined how the use of anti-obesity medication influences perceptions of effort, morality, competence, warmth, and deservingness. The findings suggest that social attitudes toward obesity treatment remain strongly shaped by beliefs about personal effort and self-control.

With more than one billion people worldwide living with obesity, the researchers noted that how a person loses weight can significantly influence how others perceive them. Although GLP-1 receptor agonists and other anti-obesity medications have demonstrated substantial effectiveness in treating obesity, they are frequently criticised as an “easy way out.”

According to the researchers, this perception reflects a broader psychological phenomenon known as effort moralization – the tendency to associate greater effort with greater moral worth.

The authors explained that such beliefs may reinforce obesity stigma, discourage people from seeking treatment, and negatively affect both physical and mental health outcomes.

While anti-obesity medications can provide important medical support for people living with persistent obesity, the researchers stressed that understanding the social impact of these perceptions is necessary if the full potential of these treatments is to be realised.

Four studies conducted across three countries

The research involved four pre-registered experimental studies conducted between November 2024 and February 2025 in Belgium, the United States, and the United Kingdom.

In total, 1,205 participants took part in the research. Participants were recruited online through university participant pools and the Prolific platform. Researchers applied several quality-control measures, excluding incomplete responses, failed attention checks, overly rapid responses, and participants with insufficient language proficiency.

Across the studies, participants were presented with descriptions of two individuals who shared identical weight-loss goals and similar experiences with diet and exercise. The only difference between the individuals was that one used an anti-obesity medication while the other did not.

Participants then rated both individuals using Likert-type scales assessing:

• Perceived effort
• Moral character
• Warmth
• Competence
• Deservingness of weight-loss success
• Willingness to cooperate with them in future scenarios

The researchers also explored several additional variables across the studies, including:

• General attitudes toward anti-obesity medication
• Personal or social experience with weight-loss medication
• Beliefs that anti-obesity medication represents a “shortcut”
• Personality traits measured using the Big Five Inventory (BFI)

To analyse the data, the researchers used t-tests, correlations, multilevel modelling, and evidence synthesis techniques.

Anti-obesity medication users viewed more negatively

Across all four studies, the findings revealed a consistent pattern of negative social judgement toward individuals using anti-obesity medication.

Compared with people relying solely on diet and exercise, anti-obesity medication users were perceived as putting in less effort into achieving their weight-loss goals.

This perception of lower effort was strongly linked to harsher moral evaluations. Participants consistently rated anti-obesity medication users as less moral than non-users.

In Study 1, for example, significantly lower perceived effort ratings for anti-obesity medication users were accompanied by similarly large reductions in moral character ratings.

The bias extended beyond morality alone.

Participants also viewed anti-obesity medication users as:

• Less competent
• Less warm
• Less deserving of their success

In addition, participants reported lower anticipated satisfaction with future cooperation involving anti-obesity medication users in a hypothetical training-partner scenario.

According to the paper’s evidence synthesis, most of these effects were large, although the effect relating to warmth was more moderate.

Perceived effort was closely tied to moral judgement

One of the most significant findings was the strong relationship between perceived effort and moral judgement.

Across all four studies, larger differences in perceived effort between medication users and non-users were associated with larger differences in moral evaluations.

The researchers concluded that perceptions of effort appear to play a major role in shaping broader social judgement.

The findings support the idea that many people continue to associate moral worth with visible personal struggle and self-discipline, particularly in relation to body weight and weight loss.

“Shortcut” beliefs intensified negative bias

The study also examined factors that influenced the strength of these perceptions.

Participants who held more positive views toward anti-obesity medications, or who had prior personal or social experience with such treatments, tended to judge medication users less harshly.

In contrast, stronger beliefs that anti-obesity medication represents a “shortcut” to weight loss were associated with more negative moral judgements.

In some analyses, these shortcut beliefs also amplified the relationship between perceived effort and bias.

The researchers found that personality traits such as conscientiousness and extraversion had little overall effect on participants’ judgements. This suggests that the bias is driven more by beliefs about effort and treatment legitimacy than by broader personality characteristics.

One exploratory analysis identified a small association with neuroticism, although this effect was limited.

Meta-analytic evidence synthesis across the studies confirmed that most effects were large, particularly for:

• Perceived effort
• Moral judgement
• Competence
• Cooperation satisfaction
• Deservingness

Effects relating to warmth were moderate by comparison.

Findings highlight social challenges surrounding obesity treatment

The researchers concluded that using anti-obesity medication is not simply a medical decision, but also a social one that may expose individuals to stigma and negative judgement.

According to the findings, people using anti-obesity medications are frequently perceived as putting in less effort and are therefore judged as less moral, less competent, and less deserving of success.

Although the studies were based on vignette scenarios rather than real-world interactions, the researchers stated that the findings point toward a widespread bias rooted in effort moralization.

They suggested that these attitudes could influence interpersonal relationships, healthcare experiences, and broader public perceptions of obesity treatment.

The authors argued that addressing these misconceptions is important for improving healthcare quality and reducing obesity-related stigma.

They also suggested that public education and changes in the way weight loss is discussed may help shift attention away from perceived effort and toward health outcomes and overall well-being.

CCH insights:

Unfortunately, this shows that there is still a very poor understanding of obesity amongst the general public, which means that biased, negative attitudes towards people with excess weight persist. Instead of being seen as medical tools to treat a complex chronic condition, GLP-1 medications are seen by many as short-cut for weight loss cheats. Current evidence suggests these attitudes are common even within the health professions. To improve the quality of obesity care, and to encourage those who need help to seek it, these misconceptions must be addressed.