The Biggest Mistakes People Make on GLP-1 Medications

GLP-1 medications can be a powerful tool, but the medication is only part of the equation. What you do alongside it determines how well you feel, how much muscle you keep, and how sustainable your results are. Over years of treating patients on these medications, I see the same avoidable mistakes again and again. Here are the ones that matter most, and how to fix each.

I am Dr. Jennifer Mbianda. I am triple board-certified in family medicine, obesity medicine, and aesthetics. Let me save you some of the trouble I watch people run into.

Mistake 1: Eating too little

Because these medications suppress appetite so effectively, it is easy to end up eating far too little without noticing. It feels fine at first, but eating too little for too long backfires. You lose more muscle, your energy tanks, and you take in fewer of the nutrients your body needs.

The fix: Eat regularly even when you are not especially hungry. Your appetite is no longer a reliable gauge of what your body needs, so you have to be intentional. Aim for balanced meals built around protein, even when they are smaller than before.

Mistake 2: Skipping protein

This is the most common and most consequential nutrition mistake. When appetite drops, protein often slides first, and protein-rich foods can feel less appealing on these medications. The problem is that under-eating protein during weight loss means more of what you lose comes from muscle rather than fat.

The fix: Make protein the anchor of every meal and aim higher than feels natural. If solid food is unappealing, a protein shake counts. This is the single highest-return habit on this list.

Mistake 3: Skipping strength training

Many people rely on the medication and diet alone and skip resistance training entirely. But without giving your muscles a reason to stick around, more of your weight loss can come from muscle, which affects your strength, your shape, and your metabolism.

The fix: Add resistance training two or three times a week, working your major muscle groups. It does not need to be intense or complicated. Consistency is what matters, and it works hand in hand with your protein intake.

Mistake 4: Not drinking enough water

When you eat less, you drink less, since a good share of daily water comes from food. Add in any early nausea, and mild dehydration is common. It shows up as fatigue, headaches, and brain fog, and it quietly makes everything else feel harder.

The fix: Drink more water than feels necessary, and pay attention to electrolytes too, since sodium, potassium, and magnesium drop alongside your food intake. Water-rich foods and electrolyte drinks both help.

Mistake 5: Letting nutrient gaps build up

Eating less of everything means taking in less of the vitamins and minerals your body runs on. Over weeks and months, those gaps can quietly widen, and they show up as fatigue, hair shedding, and other frustrating symptoms that feel like they came from nowhere.

The fix: Eat nutrient-dense foods within your smaller intake, get periodic bloodwork so you and your doctor can see your actual levels, and support your nutrition daily. This is exactly why I formulated the Jealthy Weight Loss Support Multivitamin, to help cover the nutrient gaps that open up when you are eating less. It backs up good eating rather than replacing it.

Mistake 6: Not following up with your doctor

Some people start the medication and then go quiet, skipping the check-ins and the bloodwork. But your needs change as you lose weight, and problems are far easier to catch early. Follow-up is where small issues get addressed before they become big ones.

The fix: Keep your appointments and get your labs checked periodically, including iron and B vitamins, especially if you are feeling run down or noticing changes. Bloodwork takes the guesswork out and lets you act on facts.

Mistake 7: Stopping the medication without a plan

Coming off a GLP-1 is a real transition, and doing it abruptly or without preparation makes it harder than it needs to be. As the medication leaves your system, appetite returns, and people who have not built their habits ahead of time can feel caught off guard.

The fix: Never stop on your own without talking to the doctor who prescribed it. And build your habits, protein, training, hydration, and structure, well before you stop, so they are ready to carry more of the load when the medication comes off.

Mistake 8: Comparing your journey to everyone else's

It is easy to look at someone else's pace and feel like you are doing something wrong. But bodies respond differently, and someone else's timeline tells you very little about yours. Comparison tends to drive people toward the other mistakes on this list, like eating too little to speed things up.

The fix: Focus on your own habits and how you feel, not on someone else's before-and-after. Steady, sustainable progress that protects your health beats a faster pace that costs you your muscle and energy.

The bottom line

None of these mistakes are hard to fix once you know to watch for them. Eat enough, prioritize protein, train your muscles, stay hydrated, protect your nutrition, follow up with your doctor, plan your transition, and run your own race. The medication does its part. These habits are how you do yours, and they are what turn short-term results into lasting ones.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.