Something I see regularly in my office: a patient comes in having lost a significant amount of weight on GLP-1. The numbers look good. Then I ask how they're actually doing — and the conversation shifts.
"I'm eating the same three things over and over. I don't know if I'm getting what I need." "I'm terrified to stop. What if it all comes back?" "Nobody really explained what would happen to my body."
GLP-1 medications -semaglutide, liraglutide, tirzepatide and others -are genuinely powerful tools. They represent a real shift in how we treat obesity and metabolic disease. But a medication being effective is not the same as it being used well. And right now, too many people are starting GLP-1 without having the conversations that would make it actually work for them long-term.
These are the five things I want every patient on GLP-1 to discuss with their doctor.
1. Am I losing muscle mass - and what are we doing about it?
When you lose weight rapidly, your body doesn't only shed fat. It also loses lean mass - including muscle. The research on exactly how much varies, but lean mass loss is a real concern, particularly without adequate protein and resistance training. Some studies suggest it can be a meaningful portion of total weight lost, especially in people who are sedentary or eating too little protein.
This matters more than it might seem. Muscle is metabolically active tissue. Losing it slows your metabolism, reduces your functional strength, and - critically - makes fat regain more likely if you ever stop the medication. For older adults, the stakes are even higher: muscle loss accelerates existing age-related decline and raises the risk of falls, fractures and loss of independence.
The good news is that this is largely preventable. Resistance training and adequate protein intake - generally around 1.2 to 2.0 grams per kilogram of body weight depending on your activity level, are not optional add-ons to GLP-1 therapy. They are part of how the medication is supposed to be used. Physical activity and GLP-1 work together, not in parallel. Research shows their effects on weight and muscle preservation are additive when combined correctly.
If your doctor hasn't mentioned this, bring it up. Ask specifically about strength training and protein targets.
2. Am I getting enough nutrients?
GLP-1 medications work in part by significantly suppressing appetite. For many patients, this is welcome relief. But eating much less also means taking in much less of what your body needs - and the research on this is increasingly clear.
In a dietary analysis of GLP-1 users, most failed to meet recommended intakes for vitamin D, iron, calcium and protein. A 2026 narrative review concluded that micronutrient deficiencies during GLP-1 therapy are a common consequence rather than a rare adverse effect - with particular concern around thiamine, vitamin D, iron and B vitamins. In some cases, thiamine and B vitamin deficiencies have been reported that, if not caught early, can have serious consequences. One retrospective study found that over 20% of patients had nutritional deficiencies diagnosed within one year of starting GLP-1 treatment.
What I often see clinically is something subtler than outright deficiency: patients eating very little variety, gravitating toward a handful of safe, easy foods because appetite is suppressed and cooking feels like too much. The calories go down. But so does the nutritional breadth.
Ask your doctor about baseline blood work and follow-up labs. Ask whether you should be seeing a dietitian. Ask whether a high-quality multivitamin or targeted supplementation makes sense for you.
3. When should I consider tapering or stopping?
This is a conversation most patients never have - until they've already stopped, often abruptly, because of cost, side effects, or the assumption that the work is done.
GLP-1 medications are not a short course of treatment with a natural endpoint. For many people, obesity is a chronic condition with a biological basis, and the medications that address it are more like long-term management tools than temporary interventions. Stopping them without a plan is where things often go wrong.
That said, stopping is sometimes the right decision - for practical reasons, for medical reasons, or simply because it's what the patient wants. What matters is that it's approached thoughtfully, with a clear strategy for what comes next: how to maintain activity, how to protect the nutritional gains made, and what realistic expectations look like. Slowly tapering the dose while reinforcing lifestyle habits has shown more promise for maintaining results than abrupt cessation.
This is a conversation worth having before you feel like you need to have it.
4. What happens to my weight when I come off it?
This is the question patients are often afraid to ask. And the honest answer deserves honesty.
The data on weight regain after stopping GLP-1 is consistent: clinical trials show that people who stop semaglutide or tirzepatide regain close to 10 kilograms within the first year - against an average loss of around 15 kilograms while on the medication. Real-world data suggests the picture may be somewhat more variable and the regain somewhat slower than in controlled trials, but the trend is consistent enough that it deserves an honest conversation before stopping.
This is not a personal failure. It is pharmacology. The medication works by altering appetite and satiety signalling in the brain. When it's removed, those signals revert. Your body is not broken - it is responding exactly as biology predicts.
Understanding this before stopping - rather than experiencing it as a shock afterward- changes the emotional weight of the situation entirely. I've seen patients stop GLP-1, regain weight, and interpret it as proof that they will never be able to maintain results. That's a painful conclusion to reach alone. It doesn't have to be that way if the conversation happens first.
5. Is this actually the right choice for my body?
This sounds like the first question someone would ask. In practice, it's often the last one, or never asked at all.
GLP-1 is not appropriate for everyone. Patients with a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 should not use it. There are considerations around pancreatitis history, eating disorder history, and certain mental health conditions. For patients with pre-existing anxiety or a complicated relationship with food, the appetite suppression that comes with GLP-1 can sometimes intensify rather than resolve those patterns.
More broadly: the medication fits into a person's life, not the other way around. Whether it makes sense depends on your full picture - your health history, your goals, your lifestyle, and what kind of follow-up support you have access to. A prescription without that context is an incomplete prescription.
GLP-1 can be a genuinely powerful tool. But it works best when the whole picture gets attention - not just the number on the scale.
What good follow-up actually looks like
A GLP-1 prescription should come with more than a starting dose and a follow-up in three months. At a minimum, it should include a conversation about protein and activity, baseline nutritional labs with planned follow-up, realistic expectations about what happens if treatment stops, and honest discussion about the emotional side of significant weight change - because that side is real, and it matters.
If you're on GLP-1 and those conversations haven't happened yet, it's not too late to start them. Bring this list to your next appointment. Your doctor should have answers. And if they don't - ask anyway.
This article is written for informational purposes and does not replace individualised medical advice. If you have questions about GLP-1 medications and whether they are appropriate for you, speak with your doctor.