If you’re in your 30s and your entire fitness routine revolves around burning calories, I want you to start thinking about exercise a little differently.

For years, women have been told that more cardio, fewer calories, and a lower number on the scale are the keys to getting healthy.

But there’s something we aren’t talking about nearly enough.

MUSCLE.

And not just for looking toned or fitting into your favorite jeans.

Building and maintaining muscle is one of the most important things you can do for your metabolism, blood sugar, strength, and long-term health.

As a dietitian, I want more women to understand why prioritizing muscle NOW can make such a difference in how we feel as we get older.

Let’s get into it.

1. Muscle Is About SO Much More Than Appearance

You’ve probably heard the phrase muscle is the organ of longevity.

It’s a concept that’s been gaining attention in conversations around healthy aging, including the work of physicians like Dr. Gabrielle Lyon and Dr. Peter Attia.

And there’s good reason for it.

Skeletal muscle isn’t just what helps you lift weights or carry groceries.

It’s metabolically active tissue that plays a major role in how your body uses energy and regulates blood sugar.

Here’s what maintaining healthy muscle mass can support:

• Blood sugar regulation: Your muscles help absorb glucose from your bloodstream and use it for energy.
• Metabolic health: Muscle contributes to your resting energy expenditure.
• Strength and mobility: Maintaining muscle helps you stay independent and physically capable as you age.
• Bone health: Resistance training helps maintain bone strength alongside muscle.
• Healthy aging: Greater strength and physical function are associated with better long-term health outcomes.

And here’s something I really want women to understand.

You don’t have to wait until you’re 50 or 60 to start thinking about this.

Your 30s are an excellent time to start building the habits that will support you for decades.

2. More Cardio Isn’t Always the Answer

I love walking.

I love getting my steps in.

And cardiovascular exercise absolutely has a place in a healthy lifestyle.

But if your goal is to improve your body composition, support your metabolism, and maintain strength as you age, cardio shouldn’t be the ONLY thing you’re doing.

Here’s why.

Cardio is fantastic for cardiovascular fitness and overall health, but it doesn’t provide the same muscle-building stimulus as resistance training.

Strength training gives your body a reason to build and maintain muscle.

And that matters even more when you’re trying to lose weight.

When you lose weight, your body can lose both fat and lean tissue.

Combining resistance training with adequate protein helps preserve muscle during weight loss.

So instead of focusing exclusively on how many calories you burned during a workout, I want you to start thinking about how you’re supporting your body long term.

And no, you don’t need to spend two hours in the gym every day.

Even two or three consistent strength-training sessions per week can make a meaningful difference.

The goal is to challenge your muscles progressively and build strength over time.

3. You Can’t Build Muscle Without Giving Your Body What It Needs

This is where nutrition comes in.

And it’s one of the biggest reasons I’m so passionate about getting women to prioritize protein.

Protein provides the amino acids your body needs to repair and build muscle tissue.

But I see so many women doing everything they can to exercise consistently while barely eating protein throughout the day.

Coffee for breakfast.

A small salad for lunch.

Then trying to squeeze most of their protein into dinner.

Sound familiar?

One of the biggest changes I made during my own 55-pound postpartum weight-loss journey was prioritizing protein at every meal.

And it’s something I continue to focus on today.

My recommendation: Start with 30–50g of protein at breakfast.

Instead of waiting until dinner to think about protein, start building it into your first meal.

Some of my favorite options include:

• Greek yogurt bowls with berries, chia seeds, and protein powder
• Eggs paired with cottage cheese and whole-grain toast
• Protein-packed overnight oats
• Smoothies with protein powder, berries, and flaxseed

Spreading protein throughout the day makes it easier to meet your overall needs.

And when you pair adequate protein with resistance training, you’re giving your body the building blocks and stimulus it needs to support muscle.

4. This Is Where My 90-30-50 Method Comes In

If you’ve been following me for a while, you know I’m a HUGE believer in building balanced meals around three things.

90g protein minimum. 30g fiber. Approximately 50g healthy fats.

These are the daily targets behind my 90-30-50 Method.

And while everyone’s individual nutrition needs are different, this framework gives you a simple starting point.

Here’s how each component supports your overall health.

90g+ Protein

Protein supports muscle maintenance and repair, helps keep you satisfied, and can make it easier to preserve lean tissue while losing weight.

Depending on your body size, activity level, and goals, you may benefit from more than 90 grams per day.

30g+ Fiber

Fiber supports digestive health, helps you feel fuller between meals, and can improve blood sugar management.

Think berries, vegetables, beans, lentils, chia seeds, and whole grains.

Approximately 50g Healthy Fats

Healthy fats provide essential fatty acids, support the absorption of fat-soluble vitamins, and make meals more satisfying.

Think avocado, olive oil, nuts, seeds, and fatty fish.

The important thing is that these nutrients work together to support balanced eating.

And you don’t need to eliminate carbohydrates or eat tiny portions to build a healthier body.

You need to consistently give your body the nutrients it needs.

5. Start Building Strength NOW, Not Later

If there’s one thing I want you to take away from this, it’s that your health is about so much more than the number on the scale.

You can lose weight and still benefit from building more strength.

You can be naturally thin and still need to prioritize muscle.

And you can start strength training at ANY age.

Here’s where I’d start:

1. Strength train 2–3 times per week. Focus on basic movements like squats, lunges, rows, presses, and hinges. Gradually increase the challenge as you get stronger.

2. Prioritize protein at every meal. Aim for a protein-rich breakfast and distribute your intake throughout the day.

3. Keep walking. Cardio and strength training complement each other. You don’t have to choose one.

4. Stop focusing exclusively on calories burned. Pay attention to your strength, energy, recovery, and how you feel.

5. Stay consistent. Building muscle takes time. Small habits repeated over months and years matter far more than a perfect week.

And please remember that eating enough is part of the equation, too.

Chronically undereating while pushing yourself through intense workouts isn’t a sustainable approach to building strength.

Your body needs adequate energy, protein, and recovery.

Let’s Put This Into Practice 🤎

Building muscle starts with strength training, but what you’re eating matters just as much!

Inside the Balanced Roots Nutrition app, you’ll find hundreds of balanced recipes designed around my 90-30-50 Method to help you prioritize protein, fiber, and healthy fats every single day.

Use your weekly meal planner, explore high-protein recipes, and build meals that support your strength, metabolism, and long-term health.

Remember, the goal isn’t just to lose weight. It’s to build a stronger, healthier body that supports you for years to come.

Let’s get you balanced! 🤎

Courtney