According to social media these days, weight loss is simple. All you apparently need is a prescription medication, specifically one of the new GLP-1 weekly injectable medicines, which have shown remarkable weight loss efficacy in clinical trials.
With medicines like these—and the next generation of medicines somehow looking even more promising—who needs a dietitian or a psychologist? Aren’t professionals like these obsolete, vestiges of a bygone era when weight loss meant tracking calories, reading nutrition labels, fighting food cravings, and counting steps?
In this post, you’ll learn why—surprisingly to many—dietitians and psychologists are, in fact, more important to weight loss in the GLP-1 medicine era than ever. However, what social media does get right is that the roles of these professionals in your weight loss journey have changed. Rather than teaching you to track macros or treat binge eating, for instance, they may help you develop a mindset and lifestyle to not only achieve your weight loss goal but:
- Feel the way you want to feel
- Look the way you want to look
- Enable the activities and relationships you want to experience (see Figure below)
The 7 psychology principles for a healthy weight loss journey
If you meet with a psychologist as part of your weight loss journey in 2025, you’ll likely find that the game has changed. Their focus and tools for helping you are markedly different than just a few years ago. For example, although treating mental health and eating disorders may always be part of what psychologists in this field offer, the increasing emphasis is on the following seven principles.
1. Make it a journey, not a race.
One of the most concerning side effects to health professionals about the new GLP-1 medicines is lean tissue loss (i.e., loss of muscle tissue and bone mass). However, despite what you may have read, there is no evidence that GLP-1 medicines directly cause lean tissue loss in themselves. What does cause lean tissue loss is rapid weight loss.3 Research shows that very low calorie diets, bariatric surgery, excess exercise—any treatment that produces weight loss beyond about 2 to 3 pounds per week—risks causing lean tissue loss.
What is the remedy? Slow down. Make weight loss a fun and sustainable journey rather than a sprint to the finish. This is the “Anti-Biggest Loser” mentality. Losing weight in a slow, steady way that enhances your well-being and that you can maintain in perpetuity is the formula for success.
2. Know what you’re fighting for.
With GLP-1 medicines making weight loss easier and more effective, it is more important than ever to remember: Healthy weight loss isn’t just about the numbers.
This is the time to find your “why,” the compelling personal causes, values, and people that can inspire your weight loss journey for a lifetime. No matter what weight loss method you employ, the scale will eventually stop moving. What can keep you motivated after that are the limitless opportunities for improving your quality of life, deepening your relationships, and creating meaningful new experiences. Don’t start your weight loss journey without taking the time to know your destination.
3. Believe you are worth it.
Over the long term, we only achieve what we believe we deserve. A GLP-1 medicine can increase your satiety and portion control, but it won’t convince you that you are worthy of health, love, or happiness. This is where a psychologist can make all the difference in your weight loss journey, by helping you develop the “worthiness mindset” to reach your weight loss goals and make this change an enduring part of your new and improved self-image.
4. Let go of the past.
A healthy weight loss journey isn’t just about shedding excess body fat. It is also about shedding our old identity and integrating negative past experiences that may be harming our present and preventing us from building a better future. No matter how effective our modern weight loss methods, it is difficult to move forward when burdened by the weight of our past. That’s why the assistance a psychologist can offer, addressing factors such as trauma, depression, or stigma, often remains a vital part of effective weight loss treatment.
5. Exercise for better reasons.
Many people know—either from personal experience or reading research—that exercise is less important than nutrition for weight loss goals.5 And with treatments such as GLP-1 medicines becoming more widely available, the role for exercise in a healthy weight loss journey has finally come full circle.
Although your psychologist and other providers will still encourage exercise as part of your weight loss journey, the emphasis is no longer calorie expenditure. Instead, we now promote exercise for:
- Fun, play, and recreation
- Optimizing body composition and preserving lean tissue
- Improving your quality of life
- Managing stress through physical movement
- Adventure, relationships, and personal growth
- Mental and physical health benefits
It is time to start exercising for the right reasons (above) and stop exercising for wrong reasons (losing weight, burning calories, because you are “supposed to,” punishing yourself, etc.).
6. Realign your food relationship.
Just as with exercise above, with GLP-1 medicines now driving the behavior changes and appetite control for weight loss, dietitians and psychologists are shifting their focus to helping people improve their food relationships. Ask yourself: How will my relationship with food need to change to allow me to enjoy the health, emotions, body image, and quality of life that I want to achieve from my weight loss journey?
Realigning your food relationship, for example, may consist of:
- Emphasizing food quality (e.g., protein, fiber, nutrients) over food quantity
- Eating out of self-worth instead of self-abuse
- Eating to fuel your goals instead of to manage stress or emotions
- Eating in a way that is consistent with your new identity as a person deserving of health, love, and happiness
7. Create a healthy home environment.
Finally, but no less importantly, a psychologist or dietitian helping you on your weight loss journey may encourage you to take control of your home and work environments. The aim is to make this environment inspire and support your goals instead of sabotaging them. To be healthy and happy for a lifetime, we need to customize our surroundings to make good choices easy and bad choices hard. Design your bedroom, for instance, to be an ally for sleep, your kitchen an ally for nutritious eating, and your living room an ally for health-promoting entertainment options.
