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

Women start GLP-1, their appetite drops, and for the first time in a long time, things start to change. Weight begins to come down, and adding exercise starts to feel like the next right step.

But at the same time, eating becomes harder. You get full quickly, food doesn’t sound good, and some days you barely eat without even realizing it.

So now you’re trying to exercise in a body that’s taking in very little, and that changes how your body responds in ways you may not even realize.

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What Happens When You’re Not Eating Enough

Your body is super smart.

When you’re not eating enough, it has to make decisions with what it has. And if it doesn’t have much, it will always take care of what you need to get through the day first.

So things like having enough energy to think clearly, move around, and keep your body functioning all come first.

It’s sort of like, if you had a limited amount of money and a list of bills, you would pay the ones that keep you safe first. That might mean your mortgage or rent, heat or electricity, and food. Other things, like painting the kitchen, retiling the bathroom, or replacing something that’s broken, might have to wait.

How Your Body Decides What Comes First

There is a concept called triage theory¹, introduced by researcher Bruce Ames. It basically says that when there aren’t enough vitamins and minerals coming in from food, your body “pays” for the most important things first, like keeping your organs working and your brain alert. These are the things that keep you alive. If those aren’t functioning well, nothing else really matters.

So things like building muscle, repairing connective tissue like tendons and ligaments, supporting your hair and skin, or even keeping you warm are not urgent in that moment, and they get pushed down the list.

That’s why you might notice things like:

• feeling cold all the time
• being super tired or having brain fog
• your hair shedding or feeling thinner than usual
• workouts (even short ones) feeling harder than they should

If you’re not getting enough from food, strength and recovery start to feel slower, inconsistent, or harder than expected. This happens because your body is choosing where to spend what little it has.

Only after your basic needs are covered and if it has enough material, does your body put time and energy into repairing and rebuilding muscle and connective tissue after exercise.

What Your Body Needs to Rebuild

For your body to actually repair and rebuild after a workout, it needs a few key things from food.

First: Protein.

Big surprise, I know. But this is 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.

The reason it matters so much is because 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 protein 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:

• 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
• Greek yogurt with honey and berries (a couple of spoonful’s at time is okay)
• a small bean and corn salad with a little salsa

Enough food overall.

Not just protein, but enough food in general so your body has the energy to actually carry out that repair. Because even if you’re eating some protein, your body still needs energy to use it.

This is where carbs and fats come in. They help fuel your body so it has the energy to support both your workouts and your recovery after.

Things like these all play a role here:

• Spanish rice
• baked potatoes
• fresh or frozen fruit
• olive oil (think zayt & zaatar)
• handful of mixed nuts (with walnuts – great for your brain and super easy to snack on)
• sliced avocado

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.

A few examples:

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

Even though these are needed in smaller amounts, they still matter. When you’re eating a lot less, it’s also 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 carry nutrients through your body so they can actually get where they need to go. It also plays a role in how your muscles function, how your body recovers, and even how your energy feels day to day.

When you’re not well hydrated, your blood volume drops a bit, which makes it harder for your body to deliver oxygen and nutrients where they need to go. That alone can make you feel more tired, low energy, or just off.

On GLP-1, it’s easy to drink less without realizing it, just like eating less. So if hydration drops, that’s one more layer where your body has less support.

Even being a little low on fluids can make things feel harder than they need to. It can feel like that dragging, low-energy feeling where even simple things take more effort.

This is also why some people on GLP-1s use electrolytes; they 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 that your body has to respond to. And that is important because it gives your body a reason to adapt. But the actual “getting stronger” part 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 actually has available to work with.

If you’re eating enough, your body has the support it needs to repair and rebuild. If you’re not, that process slows way down.

So it’s not just about what you do during the workout. It’s about whether your body has what it needs after, so it can actually respond to it.

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 is not 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 are 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.

Because until your body can tolerate and take in enough, it will continue to feel like everything is 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 exercise, but you may need shorter workouts until you can get your nutrition on point.

Challenging workouts can still be low intensity, using slow, controlled movements, holds, and small pulses. These don’t have to be dramatic, and they will still work your deep stabilizers and larger muscles, which is important to hold onto as you’re losing weight.

These types of movements usually feel better and allow you to move at a pace your body can handle. But exercise cannot replace what your body is missing from food. It can support the process, but it cannot fix a gap that starts with not eating enough.

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 two start to match up, things feel steadier. Workouts feel more manageable, recovery feels smoother, and progress feels more consistent.

When they’re not, it can feel like you’re doing everything right but not getting the result you expected.

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. Because without that, everything else, including your workouts, your recovery, and how you feel day to day, will continue to feel harder than it needs to.

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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/ ↩︎

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