By Michelle Tollefson, MD, FACOG

Whether you are thinking about starting a GLP-1-based medication or have just filled your prescription, you probably have questions. Will your appetite change right away? What if you feel nauseated? How much weight should you expect to lose?

At Diana Health, we want you to be informed and prepared. Starting a new medication can bring both hope and uncertainty, and knowledge can make that first month feel less overwhelming. Think of these first few weeks as an adjustment period: your body is getting used to the medication while you learn what changes in your appetite, digestion, hydration, energy, and daily routines.

Some women notice a difference after the first dose. Others need more time. Both can be normal. How quickly your appetite changes, whether you have side effects, and what happens on the scale will depend on the medication, its formulation, your starting dose, health history, and other medications.

Throughout the month, follow the instructions for the prescription you received and stay in touch with your prescriber. The goal is not to lose weight as quickly as possible. It is to find a safe, sustainable approach that supports your long-term health. If you’re taking a GLP-1 and aren’t already enrolled in our Whole Health Management Program, we can work together to personalize a whole-health approach that integrates your current medication with sustainable lifestyle changes. 

A note about terminology: To keep this article simple, we use “GLP-1” as an umbrella term. Your medication may act on GLP-1 alone or on more than one hormone pathway. Always follow the directions for your specific prescription.

At a glance

• Expect an adjustment period, not a guaranteed amount of weight loss.
• Your appetite may change quickly, slowly, or very little at first.
• Digestive side effects are common, but you do not need to have them for the medication to work.
• Hydration, nourishing food, protein, and movement matter from the beginning.
• Do not change your dose or schedule without guidance from your prescriber.
• Contact your care team for symptoms that are severe, persistent, or concerning.

The First Month Is an Adjustment Period

Many GLP-1-based medications begin at a lower dose and increase gradually. This is called dose escalation, or titration. It gives your body time to adjust and may reduce digestive side effects.

The dose you start with is usually not the dose you will stay on. Whether you see an early change on the scale or no change at all, do not adjust the medication yourself. Do not increase your dose, take extra medication, stretch doses farther apart, switch formulations, or combine GLP-1 products unless your prescriber tells you to. If you miss a dose, follow your medication’s instructions or ask your pharmacist or care team rather than doubling the next dose.

If you are having a hard time tolerating a dose, let your prescriber know. Along with your clinician, you may decide to delay a dose escalation or change your medication plan. You do not need to hide side effects or prove that you can “push through” severe symptoms. Month one is a time to learn how your body responds and plan with your care team.

Also, pay attention to more than the number on the scale. Your appetite, digestion, bowel pattern, fluid intake, energy, sleep, movement, and overall wellbeing all help tell the story of how treatment is going.

Your First Four Weeks on a GLP-1

Week 1: Establish Your Routine

Begin by following the administration directions exactly. If you use an injection, make sure you understand how to give it to yourself and how to store the medication. Storage instructions differ by medication, so follow the label for your specific product. If you take a tablet, the timing of food, fluids, and other medications may matter. If you are unsure, ask your prescriber or pharmacist. It is better to ask than to guess.

Some women feel full sooner, notice less hunger, or think about food less often during the first week. Others notice very little. Both experiences can be normal. Your digestion may change too. Nausea, diarrhea, constipation, vomiting, abdominal discomfort, reflux, burping, or bloating can occur. Some people also experience headaches or fatigue. Having no side effects does not mean the medication is not working.

If you feel full quickly, smaller portions may be more comfortable. Eat slowly and notice when you are comfortably full. Quieter hunger cues do not mean that your body no longer needs nourishment. Try not to go all day without eating.

A simple note can help you and your provider see patterns. You may want to record:

• When you took the medication and whether a dose was missed
• Appetite and fullness changes
• Digestive symptoms and your usual bowel pattern
• Fluid intake and protein-containing meals
• Energy and sleep
• Physical activity including strength training/resistance exercise
• Blood glucose readings if your clinician asked you to monitor them
• Questions for your care team

This is not about tracking yourself perfectly. It is a way to see what is changing and what support you may need. You can also easily log these in your Diana Health app or send a message to your provider if anything needs immediate attention.

Weeks 2 and 3: Notice Patterns

By weeks two and three, you may begin to see patterns. Which meal sizes feel comfortable? Do certain foods make nausea or reflux worse? Is constipation becoming a problem? How is your energy? Instead of relying on a restrictive food list from social media, pay attention to what your body is telling you and talk with your care team about symptoms that continue.

Remember, the goal is not to see how little you can eat. When appetite becomes very low, it is easy to under-eat without realizing it. That can contribute to fatigue, constipation, and inadequate nutrient intake. Even when portions are smaller, focus on nourishing foods and regular fluids.

Continue or gradually build physical activity as you are able. If nausea or fatigue changes how exercise feels, adjust the timing or intensity rather than assuming you need to stop moving.

Try not to compare your first month with a friend, family member, or influencer. They may be taking a different medication or dose and have a very different health history. Your body has its own timeline.

Week 4: Prepare for Your Check-In

Around week four, you may have a follow-up visit or receive instructions about the next dose. Timing will depend on your medication and your clinician’s plan.

Your care team may ask about your appetite, digestive symptoms, hydration, bowel habits, energy, movement, weight trend, and blood glucose if you have diabetes. A dose increase should follow the prescribed schedule and reflect how well you tolerate the medication. It is not a reward for losing more weight, and remaining at a lower dose longer is not a failure.

Before your visit, write down your questions and make sure you know how to obtain your refill or next supply of medication. However, do not wait for a scheduled appointment if symptoms are severe, persistent, or making it difficult to eat, drink, or carry out your usual activities.

Appetite and Digestive Changes

Appetite Changes Are Individual

Many women describe feeling full earlier, thinking about food less often, having fewer cravings, or noticing that “food noise” has become quieter. For others, the change is more subtle. Some do not notice much during the first month.

There is no single “right” timeline. Research on semaglutide and appetite shows that the medication can reduce appetite, cravings, and energy intake, but controlled studies do not give us a day-by-day roadmap for the first four weeks. If you are still hungry in week one, it does not automatically mean the medication will not help you. If your appetite changes quickly, it does not mean you should try to eat as little as possible.

A lower appetite may be helpful, but it can also make it easier to skip meals or fall short on nutrition. Tell your provider if you are struggling to eat enough, feel weak or dizzy, or have fatigue that persists or interferes with your day.

Most Common Side Effects Are Digestive

For semaglutide, the FDA lists nausea, diarrhea, vomiting, constipation, and abdominal pain among the most common adverse reactions. Reflux, burping, gas, and bloating may also occur. Research has found that digestive symptoms were generally mild to moderate, temporary, and most common during or soon after dose escalation.

A few practical steps may help:

• Choose smaller meals when large meals feel uncomfortable.
• Eat slowly and stop when you feel comfortably full.
• Notice whether rich, greasy, or very large meals worsen your symptoms.
• Sip fluids regularly, especially if you have diarrhea or vomiting.
• Increase fiber gradually and keep moving if constipation develops, unless your clinician recommends otherwise.
• Ask your care team before using over-the-counter medicines for ongoing symptoms.

A symptom’s severity, duration, and effect on you all matter. Mild nausea that passes is different from repeated vomiting or being unable to keep fluids down. Side effects are not proof that a medication is working, and they are not required for treatment to be effective.

Hydration, Protein, and Movement Matter Early

Hydration Supports Your Body

Nausea, vomiting, and diarrhea can lead to fluid loss. Sip fluids regularly throughout the day, and pay extra attention to hydration when digestive symptoms occur.

There is no single fluid goal for every woman. Your needs may differ if you have heart or kidney disease, take certain medications, or have been told to limit fluids. Both too little and too much fluid can be harmful. Follow your clinician’s recommendations.

Contact your care team promptly if you cannot keep fluids down, are urinating much less than usual, or have other signs of significant dehydration. 

Protein and Nutrient-Dense Foods Matter

When appetite and total food intake decrease, the foods you do eat need to do more for you. Research emphasizes nutrient-dense foods, adequate protein, and resistance training as important parts of care during GLP-1 therapy.

Protein helps support muscle and physical function during weight loss. Greek yogurt, cottage cheese, eggs, fish, poultry, tofu, soy foods, beans, and lentils are examples of protein-rich foods that may work well in smaller portions. Choose foods that fit your preferences, culture, budget, and medical needs.

Protein also helps with tissue repair and many other basic functions. Because your appetite may be lower, try to include a protein-rich food at each meal or snack rather than saving most of your protein for one large meal. For some adults, 20 to 30 grams at a meal can be a useful starting point, but it is not a rule or the right amount for everyone. For more information on protein while taking GLP-1s, review this guide from UCHealth.

If your appetite is low, consider eating the protein-rich or most nourishing part of your meal first. Add vegetables, fruit, whole grains, and healthy fats as tolerated. Protein needs are personal and can be affected by age, body size, activity, kidney function, and other health conditions.

At Diana Health, our registered dietitian can help you find a realistic target without making food feel like one more rigid set of rules. You can ask for a referral to meet with her, or if you’re already a part of our Whole Health Management Program, you’ll have the opportunity to schedule with her. 

Movement and Strength Still Matter

During the first month, continue or build activity gradually based on how you feel and the guidance you have received from your clinician. Walking, everyday movement, and brief strength sessions all count.

The Centers for Disease Control and Prevention recommends that most adults work toward at least 150 minutes of moderate-intensity aerobic activity each week and muscle-strengthening activity on at least two days. These are goals to build toward. Some activity is better than none. Every minute counts, and you can build over time.

Strength or resistance exercise deserves special attention because weight loss can include loss of lean mass. Together with adequate nutrition, strength training can support muscle, function, and long-term health. Think beyond burning calories or changing how you look. Movement can support your energy, mood, heart health, mobility, and independence.

Adequate protein and resistance training work together to support muscle during weight loss. Protein is important, but it is unlikely to protect muscle by itself if your muscles are not being challenged regularly. If you are new to strength training, start with one set of 8 to 12 repetitions for the major muscle groups at least two days a week. Body-weight exercises, resistance bands, or light weights can all be effective. Choose a resistance that feels challenging by the end of the set while you can still use good form, and increase it gradually. For exercise examples and more information on weight training, visit these Mayo Clinic websites on safe technique and strength training exercise videos. Another resource for getting started is the American Heart Association’s strength training guide. If you are unsure what is safe for you or need help with form, ask your clinician, physical therapist, or a qualified exercise professional.

If you use insulin or another medication that can cause low blood sugar, ask how activity may affect your glucose and how to recognize and treat hypoglycemia.

Follow-Up and When to Call Your Provider

What to Cover at Your First Follow-Up

The timing of your first follow-up will depend on your medication, health history, and care plan. Bring your notes and be ready to talk about:

• How you have been taking the medication and any missed doses
• Appetite, fullness, and whether you are eating enough nourishing food
• Digestive symptoms and whether they affect hydration or daily activities
• Fluid intake, urination, bowel habits, energy, and movement
• Weight trend and health goals beyond the scale
• Blood glucose readings or episodes of low blood sugar if you have diabetes
• Questions about the next dose, technique, refills, cost, or medication availability
• Pregnancy plans and any upcoming surgery or procedure involving anesthesia or deep sedation

Current FDA prescribing information advises people taking Wegovy to tell their healthcare professionals before planned surgery or procedures because GLP-1 medications can delay stomach emptying. Your surgical or anesthesia team will give you instructions for your situation.

Contact Your Healthcare Clinician Promptly

Call your prescriber or seek prompt medical guidance if you have:

• Severe or persistent nausea, vomiting, diarrhea, constipation, or other digestive symptoms
• An inability to keep fluids down, markedly reduced urination, or other signs of dehydration
• Persistent or severe abdominal pain, especially if it travels to the back, with or without nausea or vomiting
• Upper abdominal pain, fever, yellowing of the skin or eyes, or pale or clay-colored stools
• New vision changes if you have type 2 diabetes
• A racing or pounding heartbeat at rest that lasts for several minutes
• Repeated low blood glucose readings or symptoms such as sweating, shakiness, confusion, or feeling faint
• A known or suspected pregnancy

Seek Emergency Care for Severe Symptoms. Call 911 or seek emergency care for signs of a serious allergic reaction or symptoms that are getting worse quickly, including:

• Trouble breathing or swallowing
• Swelling of the face, lips, tongue, or throat
• Fainting or severe dizziness

If symptoms feel severe or are getting worse quickly, do not wait for a reply to an online or phone message.

Month One At a Glance

During your first month on semaglutide or another GLP-1-based medication:

• Learn what is normal for your body instead of comparing your experience with someone else’s.
• Follow your medication instructions, and do not rush dose changes.
• Drink fluids regularly and prioritize nourishing foods and protein.
• Keep moving and include strength or resistance exercise as you are able.
• Report symptoms that are severe, persistent, or concerning.
• Use follow-up visits to make your treatment plan more personal and sustainable.

At Diana Health, we see GLP-1 medication as one tool within a whole-person plan. Nutrition, movement, sleep, stress, mental health, and your preferences still matter. There is no shame, blame, or guilt in asking for support. Our physicians, certified nurse midwives, registered dietitians, wellness coaches, and mental health professionals are here to support your whole health.

That whole-person approach is at the heart of our Whole Health Weight Management Program. The program combines evidence-based GLP-1 medications, nutrition support, and personalized care designed around women’s hormones, metabolism, and long-term health. Weight loss is only part of the story—we’re here to help you build a plan that supports your health for the long term.

For more about lifestyle habits during GLP-1 treatment, read More than Medication: How to Thrive on GLP-1s. You can also explore Diana Health’s wellness care or learn more about our Whole Health Weight Management Program. If you’re ready to talk through whether this approach may be right for you, book a visit with our team. We are here to educate, listen, and support you as you find what works best for you.