For decades, mainstream culture has told us that “weight loss = health” and that “thin” is the ideal. Many healthcare providers, diet programs, and media outlets have reinforced the idea that lowering the number on the scale should be the ultimate goal for well-being. Yet, research in psychology and medicine challenges this weight-centric approach with real weight science.
Instead of focusing on weight, modern weight science highlights the importance of eating healthily, moving moderately, and practicing self-compassion. At the Cognitive and Interpersonal Therapy Centre (CITC), we understand the drawbacks of weight-centered thinking and are here to clear up common myths about weight loss, while sharing practical tips for supporting your health, without the obsession over the scale.
The Drawbacks of a Weight-Centric Approach
While it might seem intuitive that pursuing weight loss is synonymous with pursuing better health, the evidence tells a more complicated story. In fact, research shows that genetics are responsible for 70% of the reason that people are the weight they are, and 30% is due to an individual’s environment. Thus, focusing too heavily on weight can cause harm in several ways:
1. Weight Cycling (yo-yo dieting)
Most diets are not sustainable long-term. Studies show that the majority of people regain the weight they lose within three to five years, often gaining back more than they lost initially. This repeated cycle of losing and regaining weight – known as weight cycling – has been linked to increased health concerns such as cardiovascular issues, insulin resistance, and psychological distress.
2. Impact on Mental Health
Studies show that a weight-focused approach is associated with many mental health concerns, including an increased focus on body image, more body dissatisfaction, decreased self-esteem, disordered eating, depression, anxiety, and decreased quality of life. This focus on weight loss can increase shame and self-blame, even though weight is largely out of one’s control. Weight science demonstrates that health is more complex than a number on the scale and requires consideration of psychological well-being.
3. Stigma, Biases, and Discrimination
People living in larger bodies often encounter biases and discrimination in healthcare settings, workplaces, and social contexts. Research shows that weight stigma itself, independent of body size, has been associated with increased stress, decreased quality of healthcare, and avoidance of seeking medical care altogether when individuals feel discriminated against.
4. Overlooking Other Health Indicators
An emphasis on weight loss in the medical system can overshadow more meaningful markers of health, such as blood pressure, cholesterol, blood sugar, sleep quality, and mental health. Weight science reminds us that two people with the same body mass index (BMI) can have very different health outcomes depending on lifestyle and genetics, and just because someone has a higher BMI, does not automatically suggest they are unhealthy.
Weight Science’s Set Point Theory
Why is it so difficult to maintain weight loss?
We all have a weight range that our bodies will try to defend, influenced by genetics, environment, and life stage. Think of it working like a thermometer. This is called our “set point.” If we are under-eating or under-weight for our bodies, a complex set of systems in our bodies kick into action to return to our set point. This is the weight that our bodies function optimally at and being under-weight or under-nourished can potentially lead to negative consequences on our organs, emotions, and thought processes.
In the short term, our bodies also defend us against weight gain or over-eating. For example, if you go to an all-inclusive vacation for a week and eat more than you typically do, you might experience a temporary weight increase, but your body will return to its “natural” weight once you return home and to your regular eating patterns. However, the body will only spend some time, around 6 months, according to mice studies, defending against this higher weight. And so, with sustained weight gain, for example with binge eating or overconsumption in the long term, we can actually achieve a change in our body’s set point. If we think about it, this makes sense on an evolutionary level, the body wants to prepare for and defend against starvation and famine.
Studies show that individuals who have been able to maintain weight loss do so by eating significantly fewer calories than recommended for their body and engaging in extensive exercise daily. Now that we know about Set Point Theory, we can see why maintaining weight loss is so hard, it’s fighting biology!
Weight Science Myth Busting: Common Misconceptions About Weight Loss
Myth 1: “Anyone can lose weight and keep it off if they try hard enough.”
Reality: Long-term weight science studies consistently show that 80-95% of people regain weight after dieting. As we said, this is biology, not willpower.
Myth 2: “Lower weight automatically means better health.”
Reality: Health improvements often associated with weight loss – such as better blood sugar control and lower blood pressure – are largely due to behaviour changes like improved nutrition and increased movement, not the weight change itself. People living in larger bodies can achieve these same benefits without weight loss.
Myth 3: “BMI is an accurate measure of health.”
Reality: BMI is a simple ratio of height to weight, developed in the 19th century by a mathematician for research purposes. It was not developed for medical use. In fact, weight science indicates that BMI does not account for other important health indicators such as muscle mass, body composition, genetics, or lifestyle factors. Many people classified as “overweight” or “obese” by BMI are metabolically healthy.
Myth 4: “Diets are harmless as long as you lose weight.”
Reality: Dieting can increase preoccupation with food, disrupt hunger and fullness cues, and increase the risk of eating disorders. Weight cycling in particular is linked to negative health outcomes, as mentioned above.
Practical Tips for Supporting Your Health Without Focusing on Weight
So, if the number on the scale isn’t the most reliable indicator, what can you focus on instead? Here are evidence-based strategies for supporting physical and psychological well-being:
- Find your set point by eating healthily (i.e., with adequate nutrition and food groups) and exercising moderately (150 minutes per week).
- Don’t deprive yourself of treats and enjoyable food! Our bodies accept up to two exceptional days per week (this is defined as consuming 30% to 50% more calories than recommended by the Canadian food guide on a given day).
- Focus on behaviours, not numbers. Put your energy towards activities that support your well-being (such as getting enough sleep, eating balanced meals, and moving your body in ways that feel good) instead of focusing on the number of pounds lost.
- Be attuned to your mental health and stress. Psychological health plays a critical role in physical health. Practices such as mindfulness, journaling, therapy, and social connection can buffer stress and help overall health.
- Seek weight-inclusive healthcare. Look for providers who practice a weight-inclusive or Health at Every Size (HAES) approach. These providers emphasize health-promoting behaviours without prescribing weight loss as the main goal.
The Bottom Line of Weight Science
Weight science challenges many of the assumptions we’ve inherited about body size, dieting, and health. A weight-centric approach often leads to frustration, stigma, and physical or psychological harm. Set-point theory reminds us that the body is designed to resist attempts to drastically alter its weight, making long-term weight loss uncommon and difficult.
By shifting focus from weight to behaviours, individuals can cultivate sustainable well-being that honours both body and mind. Practical steps – like eating healthily, moving moderately, and stress management – support health without reinforcing harmful cycles of dieting and weight stigma.
Every body deserves compassionate and evidence-based care. Whether you are navigating challenges with eating, struggling with body image, or simply seeking a healthier relationship with your body, you are not alone. Our clinicians can help you explore these issues in a supportive and non-judgmental environment.
How CITC Can Help
At CITC, our clinicians provide supportive, evidence-based therapy to help you build a positive relationship with food, your body, and your health. Contact our clinical coordinator today to discuss therapy options surrounding body image, disordered eating, or health related concerns.
Written by Alina Patel, PhD Level Therapist at CITC
References and Further Reading
Bacon, L., & Aphramor, L. (2011). Weight science: evaluating the evidence for a paradigm shift. Nutrition journal, 10, 9. https://doi.org/10.1186/1475-2891-10-9
Hunger, J. M., Smith, J. P., & Tomiyama, A. J. (2020). An evidence‐based rationale for adopting weight‐inclusive health policy. Social Issues and Policy Review, 14(1), 73–107. https://doi.org/10.1111/sipr.12062
Levinson, J. A., Clifford, D., Laing, E. M., Harris, C. L., Slagel, N., Squires, N. D., & Hunger, J. M. (2024). Weight-inclusive approaches to nutrition and dietetics: A needed paradigm shift. Journal of Nutrition Education and Behavior, 56(12), 923–930. https://doi.org/10.1016/j.jneb.2024.07.007
Nuttall F. Q. (2015). Body Mass Index: Obesity, BMI, and Health: A Critical Review. Nutrition today, 50(3), 117–128. https://doi.org/10.1097/NT.0000000000000092
Ochner, C. N., Barrios, D. M., Lee, C. D., & Pi-Sunyer, F. X. (2013). Biological mechanisms that promote weight regain following weight loss in obese humans. Physiology & behavior, 120, 106–113. https://doi.org/10.1016/j.physbeh.2013.07.009
Stunkard, A. J., Harris, J. R., Pedersen, N. L., & McClearn, G. E. (1990). The body-mass index of twins who have been reared apart. The New England journal of medicine, 322(21), 1483–1487. https://doi.org/10.1056/NEJM199005243222102
https://food-guide.canada.ca/en/tips-for-healthy-eating/physical-activity-healthy-eating/
