Setting a specific weight loss goal before starting a GLP-1 medication like Zepbound may be the difference between modest results and significant success. A new study of nearly 81,000 people found that those who established personal weight loss targets experienced greater weight loss compared to those without preset goals. The findings also revealed that women lost substantially more weight than men while using tirzepatide, the active ingredient in both Zepbound and Mounjaro.

Why Does Goal Setting Matter for Weight Loss Medication?

The research analyzed data from 80,942 individuals with an average age of 43 who had just begun treatment with tirzepatide. At the 12-month follow-up, 4,429 participants remained in the study. The key finding was striking: individuals who set a baseline weight loss goal and had previously attempted structured diet plans achieved a higher percentage of weight loss compared to those without preset targets.

The mechanism behind this success isn't mysterious. Psychological research has long shown that goal-setting provides direction, focuses attention, and helps maintain commitment and motivation. When combined with GLP-1 medications, which work on the biological side of appetite suppression, goal-setting addresses the behavioral components of weight management.

"While the GLP-1 medications can help with the biological aspects of appetite and food noise, goal setting helps with the behavioral pieces, such as monitoring progress, making intentional choices, and maintaining consistency," explained Nicole Andreoli, a licensed psychologist with Pathway Psychological Services in New York.

Nicole Andreoli, Ph.D., Licensed Psychologist at Pathway Psychological Services

What Other Factors Influence Weight Loss on GLP-1 Drugs?

Beyond goal-setting, the study identified several other factors that affected weight loss outcomes. Women were significantly more likely than men to achieve a 20% total body weight loss by the 12-month follow-up, suggesting sex-specific differences in how these medications work. Additionally, people with pre-existing health conditions at the start of the study were less likely to reach the 20% body weight loss target.

Conditions that reduced the likelihood of achieving major weight loss included:

• Metabolically-dysfunctional-associated liver disease (MASLD): A condition affecting liver function and metabolism that may complicate weight loss efforts
• Type 2 diabetes: Pre-existing metabolic dysfunction that can influence medication effectiveness
• Other metabolic conditions: Various baseline health issues that may slow weight loss progress

These findings suggest that doctors need to tailor their approach based on individual patient circumstances. Some patients may benefit from additional behavioral support alongside their medication, particularly those facing motivational barriers.

How to Maximize Weight Loss Success With GLP-1 Medications

• Set a realistic weight loss goal: Establish a specific, achievable target before starting medication to provide direction and maintain motivation throughout your treatment
• Prioritize protein and vegetables while reducing carbohydrates: Focus on whole foods that encourage the body to burn fat stores and support sustainable eating patterns
• Incorporate regular physical activity: Even moderate exercise like walking helps minimize muscle loss during the weight loss process and supports long-term health
• Develop food awareness: Pay attention to your relationship with food, identify emotional eating triggers, and learn to recognize your body's natural hunger and fullness cues
• Work with behavioral support: Consider additional counseling or coaching, especially if you have pre-existing health conditions or struggle with motivation

Experts emphasize that GLP-1 medications create a unique window of opportunity. The appetite suppression these drugs provide allows people to rebuild healthy eating patterns and develop awareness of their body's internal signals. This behavioral foundation becomes critical for long-term success.

"GLP-1 medications create a unique opportunity to rebuild healthy eating patterns, create a greater awareness of your body's internal cues for hunger and fullness, and to identify any emotional factors that influence eating. Ultimately, the goal is not just weight loss but to develop habits and skills that last long after the initial weight loss phase," noted Andreoli.

Nicole Andreoli, Ph.D., Licensed Psychologist at Pathway Psychological Services

One important caveat: research shows that many people regain weight when they stop taking GLP-1 medications. This underscores why the behavioral and lifestyle changes developed during treatment are so valuable. The goal isn't just to lose weight while on medication; it's to establish sustainable habits that persist long-term.

For patients considering Zepbound or similar medications, the takeaway is clear. Before you start, sit down and define what success looks like for you. Set a specific goal, commit to behavioral changes alongside the medication, and work with your healthcare provider to address any underlying health conditions that might affect your results. The combination of medication, goal-setting, and lifestyle change appears to be the winning formula.