Weight loss drugs should only be prescribed after a thorough assessment of the potential health benefits and associated risks or side effects. Careful consideration of these factors is essential to ensure that therapeutic benefits outweigh adverse effects. In addition, treatment outcomes should be tailored to the patient's specific clinical condition, taking into account the patient's medical history, current health status, and long-term well-being goals. This personalized approach ensures that the intervention is both safe and effective, promoting overall health improvement.
But why? Isn't this the simplest approach to tackling obesity without complications?
Although the general advice to 'eat less and move more' is still offered by some health professionals to overweight people, my aim is to encourage greater empathy and understanding both in the wider health community and in my own clinical practice.
Focusing solely on weight loss without taking into account lifestyle modifications or changes in body composition can be risky. This approach can lead to lasting negative effects on the patient's health. Ignoring critical factors such as preserving muscle mass, improving metabolic health, and adopting sustainable habits can hinder long-term well-being.
Neglecting these aspects can lead to metabolic disorders, loss of muscle strength and increased likelihood of weight regain. Therefore, a holistic approach that emphasizes dietary changes, lifestyle adjustments, and attention to body composition is essential to promote optimal health and prevent long-term complications.
The reality is that many people still struggle to understand the complex biological basis of obesity as a medical condition. This misunderstanding is analogous to efforts to recognize depression as a neurochemical and biological disease. Similarly, obesity is a multifaceted condition influenced by genetics, physiology, and various biological mechanisms, making it more difficult to grasp.
During one of my last lectures, I asked everyone in the room if they had ever seen an obese person and they silently thought, "Maybe they should move more or eat less?" To my surprise, every hand went up. Now think about it: when you meet someone with cancer, do you think, "Maybe they should stop smoking or follow a healthier diet?" The answer is clearly "no." But what if I told you that 40% of cancer cases could be avoided through diet and lifestyle changes?
This illustrates why I started my lecture this way. Dealing with obesity requires facing the stigma attached to it. It is impossible to educate individuals about obesity management without addressing its root causes, especially in a room full of medical professionals.
Once we achieve a deeper understanding of obesity as a medical condition, we can move beyond prejudices and misconceptions, breaking down stigmatizing attitudes. This knowledge helps reduce discrimination and promotes a compassionate, evidence-based approach to treatment.
The importance of skeletal muscle mass is increasingly recognized in the medical community. One of the reasons for this growing interest is the impact of GLP-1 receptor agonists, effective weight loss drugs that can lead to significant loss of muscle mass. Research has shown that muscle loss is associated with a reduction in fat-free mass (FFM). This loss of muscle mass is primarily related to the volume of weight loss rather than the direct effect of GLP-1 receptor agonists, although further research is needed.
In the context of this, unprocessed caloric restriction typically results in a smaller amount of weight loss and reductions in FFM from 10% to 30%. The percentage of muscle mass loss associated with GLP-1 receptor agonists exceeds the expected natural age-related loss of about 0.8% per year (or 8% per decade) between 40 and 70 years of age.
Ignoring the impact of muscle loss can create a disconnect between patients' understanding of the role of muscle in overall health and clinicians who may underestimate its importance, affecting treatment adherence and outcomes.
It has been suggested that significant reductions in FFM from short-term weight loss may not impair physical functions, such as muscle strength. While muscle mass and strength are usually positively correlated, they do not always decline together, especially in cases of obesity, metabolic disorders, or aging. Improvements in muscle composition, such as a reduction in myosteatosis (the incorporation of fat into muscle), can improve muscle quality, defined as the ratio of muscle strength to muscle mass. If muscle composition is improved, overall body composition may also improve, maintaining or even improving muscle function and strength.
Although evidence for the effects of GLP-1 receptor agonists is limited, results from bariatric and metabolic surgery suggest that loss of muscle mass does not necessarily result in loss of strength. However, muscle strength is only one aspect of the importance of muscle. In addition to their functional role, skeletal muscles play key metabolic functions beyond movement and physical strength. They act as a reservoir for amino acids during times of stress, trauma, or infection and synthesize and store glutamine, which is vital for nitrogen transport and immune function.
In addition, muscle mass is critical for glucose homeostasis, helping to absorb glucose in response to insulin and maintain normal blood sugar levels. Myokines produced by muscle - signaling molecules released by muscle cells - act as endocrine factors influencing metabolism, energy balance, and inflammation. These myokines also regulate immune system function. Therefore, preservation of skeletal muscle mass is essential to maintain physical function and support metabolic health, immune response, and general well-being.
Recent studies of myokines have allowed us to better understand muscle-organ communication and have highlighted myokines as potential therapeutic targets and biomarkers. This is particularly important for exercise-based treatments for chronic diseases such as cancer, diabetes and neurodegenerative disorders.
In summary, the roles of skeletal muscle mass are much more than those of movement, highlighting the importance of preserving muscle mass during weight loss interventions. Both clinicians and patients need to understand the importance of muscle health to ensure optimization of treatment strategies for long-term well-being.
Accurate measurement of body composition is essential for understanding individual health, particularly in relation to obesity and weight management. Unlike traditional metrics, such as body mass index (BMI), which consider only total body weight, body composition analysis - such as bioelectrical impedance analysis (BIA) and bioimpedance spectroscopy (BIS) - provides a detailed understanding of the proportions of fat, muscle and other tissues. This detailed information is essential for assessing overall health and developing personalized treatment strategies.
For example, by focusing on fat loss while preserving muscle mass, you can improve metabolic health and reduce the risk of chronic disease. In addition, tracking body composition helps to evaluate the effectiveness of weight loss interventions, ensuring that they do not inadvertently lead to muscle loss - a particularly important aspect with weight loss medications such as GLP-1 agonists.
As a nutritionist, I encourage people who want to manage their weight and improve their health to consider the following:
By following these guidelines, you can develop a healthier relationship with food and your body, which will lead to better health outcomes and improved quality of life.
