Experiencing a plateau while using GLP-1 medications such as Wegovy® or Mounjaro® for weight loss is common and can feel discouraging. A weight loss plateau does not necessarily mean your treatment has stopped working.
This guide explains why plateaus happen during GLP-1 treatment, what steps can help restart progress, and when it may be appropriate to review your treatment plan with a MedExpress clinician.
Overview
Use this guide to understand:
• Why weight loss plateaus can occur during GLP-1 treatment
• Why plateaus sometimes occur after switching from Mounjaro® to Wegovy®
• Practical strategies to support continued weight loss
• When to seek guidance from a MedExpress clinician
Understanding weight loss plateaus on GLP-1 treatment
A weight loss plateau means your weight remains stable despite continuing treatment and healthy habits. This can happen as the body adapts to metabolic changes or a lower body weight.
Plateaus are a normal part of many weight loss journeys, including treatment with GLP-1 medications such as Wegovy® (semaglutide) and Mounjaro® (tirzepatide).
Recognising a plateau helps set realistic expectations and allows you to plan the next steps effectively.
Why weight loss may stall during GLP-1 treatment
A plateau does not necessarily indicate treatment failure. Several factors can contribute to a temporary slowdown in weight loss.
Metabolic adaptation
As your weight decreases, your body requires fewer calories to maintain basic functions. Habits that supported earlier weight loss may need small adjustments as your body weight changes.
Adjustment after switching medications
Some patients notice a short plateau after switching from Mounjaro® to Wegovy®. This can occur because the body is adjusting to a different medication.
A typical treatment switch includes a short gap between medications. It can take 2–4 weeks for Wegovy® to reach steady levels in the body, which may temporarily affect appetite signals and weight loss speed.
Hormonal differences between medications
Mounjaro® targets two hormones (GLP-1 and GIP), while Wegovy® targets GLP-1 alone.
Because of this difference, appetite regulation and satiety signals may change for a few weeks while your body adjusts to the new medication.
Immediate steps to address a plateau
If your weight has not changed for several weeks, small adjustments to daily habits may help support further progress.
Review diet and physical activity
Minor changes to nutrition or exercise routines can help restart weight loss. Focus on balanced meals and consistent movement.
Monitor medication adherence
Ensure your GLP-1 injections are being taken consistently according to the schedule recommended by your MedExpress clinician.
Track progress and lifestyle patterns
Monitoring weight, activity levels, sleep quality, and eating patterns can help identify small changes that may improve progress.
Strategies to help break a weight loss plateau
The following strategies may help support continued weight loss during GLP-1 treatment.
Prioritise protein intake
Aim for approximately 30–40 g of protein per meal. Adequate protein helps maintain lean muscle mass, which supports metabolic rate during weight loss.
Add resistance training
Strength training helps maintain muscle while reducing body fat. Even two short sessions per week using bodyweight exercises can be beneficial.
Increase daily movement (NEAT)
Non-Exercise Activity Thermogenesis (NEAT) refers to everyday physical activity, such as:
• Taking the stairs
• Walking during phone calls
• Taking short walks after meals
Small increases in daily movement can significantly increase overall energy expenditure.
Focus on sleep quality
Poor sleep can disrupt hormones that regulate hunger (ghrelin and leptin). Aim for 7–9 hours of sleep per night where possible.
Staying motivated during a plateau
Plateaus can feel frustrating, but they often reflect the body stabilising after weight loss.
Helpful mindset strategies include:
• Looking for non-scale progress such as improved energy or fitness
• Maintaining consistent weekly injections and healthy habits
• Accepting that weight loss progress is rarely perfectly linear
When to consult a MedExpress clinician
A MedExpress clinician may review your treatment plan if:
• Your weight loss plateau lasts four weeks or longer
• You experience new or worsening side effects
• You are considering adjusting your medication dose
• You want to explore alternative GLP-1 treatment options
Next steps and treatment adjustments
If needed, a MedExpress clinician may review your progress and discuss options such as:
• Adjusting your GLP-1 dose if clinically appropriate
• Reviewing nutrition, activity, or lifestyle factors
• Considering alternative GLP-1 treatments if suitable
Any changes to medication will always be assessed carefully for safety and effectiveness.
Key takeaway
Weight loss plateaus during GLP-1 treatment are common and usually temporary. Consistent medication use, balanced nutrition, regular movement, and adequate sleep can help support continued progress.
If a plateau continues for several weeks, a MedExpress clinician can review your treatment plan and help determine the most appropriate next steps.
If you still need help after reviewing the information above, additional assistance is available.