Workouts Feel Harder and Recovery Slows When You’re Not Eating Enough on GLP-1

Have you ever tried to get through a workout, clean your house, or even just focus on something simple and felt completely off? Like your energy drops out halfway through, your patience is gone, you feel a little shaky or lightheaded, and everything takes more effort than it should.

That’s what under-fueling feels like. And on GLP-1, it can happen without you even realizing it. Your appetite drops, you eat less, and at first it feels like progress. But over time, your body starts trying to do more with less.

So when you add exercise on top of that, things don’t feel the way you expect them to. Workouts feel extremely exhausting instead of energizing and strong, recovery slows way down, and even day-to-day tasks can start to feel harder than they should.

---

How Your Body Decides What Comes First

When your body isn’t getting enough food, it has to prioritize. It doesn’t have the option to do everything well, so it uses what it has to keep you alive. This is called triage theory.¹ It was introduced by researcher Bruce Ames, but the idea itself is pretty simple.

Basic, non-negotiable functions come first. Things like staying alert, moving through the day, and keeping your organs running. But even those can start to feel off if you’re not eating enough for too long.

Everything else gets pushed back. Building muscle, recovering from workouts, repairing tendons and ligaments, even things like your hair, skin, or how well your body regulates temperature.

That’s when you start to notice that workouts don’t feel the way you expect them to. Recovery takes longer and even normal parts of your day can feel harder than they should.

Your body is working with less and making decisions about where that energy goes. Only after your basic needs are covered, and if there’s enough left over, does it put energy into repairing and rebuilding muscle after exercise.

What Your Body Needs to Rebuild

Protein

We all know this one matters, but it’s also the one most women struggle with on GLP-1. The smell, the texture, even the thought of it can feel like too much some days.

Protein is what your body actually uses to repair muscle after you exercise. When you work out, you’re creating small amounts of stress in the muscle. Protein helps your body go in and rebuild that area so it’s a little stronger the next time.

If there isn’t enough coming in, that repair process is limited. So even if you’re showing up and doing the workouts, your body doesn’t have what it needs to follow through on them.

This doesn’t mean you need to eat a large amount all at once. Even small amounts, consistently, can start to make a difference.

This can come from foods like:

• A small bean and corn salad with a little salsa
• Rotisserie or grilled chicken with a little feta (kabobs work really well here because they’re already in small pieces you can grab and eat slowly)
• A small or half serving of baked or broiled fish with lemon and olive oil
• Hard boiled, poached, or scrambled eggs with a spoonful of cottage cheese or feta
• Greek yogurt with honey and berries (a couple of spoonfuls at time is okay)

If solid food feels like too much, protein shakes or smoothies can help you get something in. Just think of them as a backup, not the main plan. Actually eating your food will be more satisfying and easier to sustain over time.

Enough Food Overall

It’s not just protein. Your body also needs enough food in general so it has the energy to actually carry out that repair.

Even if you’re eating some protein, your body still needs energy to use it. That’s where carbs and fats come in. They help fuel your body so it can support both your workouts and your recovery.

Things like these all play a role here:

• Spanish rice
• Baked potatoes
• Fresh or frozen fruit
• Olive oil (think zayt & za’atar²)
• Handful of mixed nuts (walnuts are great here and easy to snack on)
• Sliced avocado

Remember, even small amounts throughout the day can help your body feel more supported.

Vitamins and Minerals

Vitamins and minerals help everything run the way it’s supposed to.

• Vitamin C helps your body build collagen, which supports tendons and ligaments (berries, citrus, peppers)
• Magnesium supports your muscles and nervous system, which affects recovery and sleep (leafy greens, nuts, seeds)
• B vitamins help your body turn food into energy so you can actually use what you eat (meat, eggs, whole grains)

Also, keep in mind that when you’re eating less, it’s easier to fall short on things like vitamin D, iron, or zinc, which can affect your energy, recovery, and how your body feels overall.

Hydration

Water helps move oxygen and nutrients through your body so they can actually get where they need to go. It also supports muscle function, recovery, and your energy throughout the day.

On GLP-1, it’s easy to drink less without realizing it, just like eating less. But, when fluids get too low, you’ll be able to tell pretty quickly. You’ll notice thinks like frequent headaches, feeling a little nauseous, low energy, trouble focusing, or just feeling off in general.

This is also why some people use electrolytes. They can help your body hold onto and use fluids more effectively.

How Your Body Actually Gets Stronger

When you exercise, your body isn’t getting stronger in that moment. What you’re doing during a workout is creating a challenge, a small amount of stress your body has to respond to. That’s what gives your body a reason to adapt. But the actual “getting stronger” happens after the workout.

It happens when your body repairs what was challenged and rebuilds it so it can handle that same effort, or a little more, more easily next time. That repair process is where progress comes from, and it depends on what your body has available to work with.

This is also why things don’t stay the same. Once your body gets used to a movement, that same effort stops doing as much. So to keep making progress, something has to increase. That might be a little more resistance, a slower tempo, more control, or simply doing the movement better than before. That gradual increase is progressive overload.

If that challenge goes up but your body doesn’t have enough support from food, it can’t keep up with it. That’s where things start to stall because your body doesn’t have what it needs to get stronger.

When Eating Feels Almost Impossible

For some women, eating enough on GLP-1 is not just hard. It can feel almost impossible.

If you’re at the point where food makes you feel sick, you get full after a few bites, or you have no desire to eat at all, this isn’t about making better choices or trying harder. It means your body isn’t taking in enough to support daily life, let alone anything extra like exercise. And when that’s the case, everything else starts to get affected, including your energy, recovery, sleep, and even things like your skin, hair, and nails, which may feel drier, thinner, or more brittle than usual.

If you’re barely able to eat, or relying mostly on liquids, that needs to be addressed first. That may mean having a conversation with your doctor about how the medication is affecting you, especially if it’s making it difficult to get enough food in throughout the day.

In the meantime, a few small adjustments can help take the pressure off:

• Smaller amounts more often can feel easier than trying to sit down to full meals
• Setting reminders to eat can help, since hunger cues are often very low
• Keeping foods simple and easier to tolerate can make a difference on days when nothing sounds good

You don’t have to figure this out on your own either. Getting support from a registered dietitian or even just having a few go-to foods that feel manageable can make this phase a little easier to work through.

Because until your body can tolerate and take in enough, everything else, your workouts, your recovery, and how you feel day to day, will continue to feel harder than it should be.

How to Approach Exercise Right Now

Exercise can be adjusted to meet you where you are. You can and should still move, but you may need shorter workouts until your nutrition is in a better place.

That doesn’t mean it has to be easy to be effective. Slow, controlled movements, different angles, holds, and small pulses can still be very challenging. They work your deeper stabilizers and your larger muscles, which is important to hold onto as you’re losing weight.

These types of movements usually feel better and let you move at a pace your body can actually handle. Your muscles don’t know the difference between a barbell and your bodyweight, but they do respond to a challenge.

At the same time, exercise can’t replace what your body is missing from food. It can support the process, but it can’t make up for a gap that starts with not eating enough. Without the materials, there’s nothing to rebuild with after the workout.

When Things Start to Work Together

For your body to get stronger, two things have to match up:

• What you’re asking your body to do through exercise
• What you’re giving your body through food to support it

When those start to line up, things feel different. Workouts feel more manageable, recovery is more consistent, and progress starts to make sense.

Being on a GLP-1 can create an opportunity to build a healthier relationship with food over time. But that starts with being able to eat enough to support your body first.

---

Resource

1. Ames BN. Low micronutrient intake may accelerate the degenerative diseases of aging through allocation of scarce micronutrients by triage. Proc Natl Acad Sci U S A. 2006 Nov 21;103(47):17589-94. doi: 10.1073/pnas.0608757103. Epub 2006 Nov 13. PMID: 17101959; PMCID: PMC1693790. https://pmc.ncbi.nlm.nih.gov/articles/PMC1693790/ ↩︎
2. https://en.wikipedia.org/wiki/Za%27atar#:~:text=Za’atar%20refers%20both%20to,Collection%20though%20lacking%20definitive%20attribution. ↩︎

Photo Credits

Single leaf of lettuce on a plate by Sebastian Moldoveanu’s Images

Health – words from wooden blocks with letters by Roman Didkivskyi from Getty Images