Protein After 40: What You Need to Know for Building and Keeping Muscle
Why Protein Matters After 40
If you’re getting back into fitness after 40, trying to change your body composition, or losing weight while trying to keep muscle, protein is worth paying attention to.
You may not need a protein powder. But getting enough protein each day can make it easier to support muscle growth, recovery, and healthy aging.
The Approach To Protein
Make Protein Part of Your Daily Plan
After 40, maintaining and building muscle becomes an important part of a fitness restart. Start by including a quality protein source with your meals. Protein powder can be useful when food alone makes it difficult to meet your needs, but it shouldn’t replace a balanced diet.
For people doing resistance training, research shows that adequate protein can help support increases in muscle mass and strength. Protein supplementation and resistance training
Simple approach:
Protein at breakfast + lunch + dinner, with a shake or protein-rich snack when needed.
Think About Muscle, Not Just Weight
If your goal is to change body composition, the number on the scale isn’t the whole story. You want to lose excess body fat while maintaining or building muscle. That’s especially important when weight loss is occurring with reduced appetite.
For people using GLP-1 medications, maintaining muscle deserves particular attention. Recent research found that a meaningful portion of weight lost during incretin-based treatment can be lean mass. Resistance training and adequate protein can be important parts of a muscle-preserving strategy. Scientific evidence — GLP-1 medications and lean mass
For women, particularly around and after menopause, muscle and bone health are also important considerations. Resistance training and adequate nutrition—including protein—are part of the bigger picture. Scientific evidence — Whey protein and postmenopausal women
Choose Protein That Fits
You don’t need the “best” protein powder. Look for one that provides a useful amount of protein, fits your dietary needs, agrees with your digestion, and is convenient enough that you’ll actually use it.
The most important choice is the one that helps you consistently meet your overall protein needs. I’ve learned this firsthand during my own fitness restart. Getting stronger isn’t about finding one perfect product or program. It’s about finding approaches you can consistently use.
Summary & Next Steps
If you’re restarting fitness after 40, start with the basics:
- Strength train consistently.
Give your muscles a reason to grow and adapt. - Make protein a regular part of your diet.
Use food first, and consider protein powder when convenience helps - Look beyond the scale.
Pay attention to strength, body composition, energy, and how you feel. - Choose products based on your needs—not hype.
Want to compare protein options?
Visit the Strength Restart Nutrition & Supplements page for our protein product comparisons, including protein source, amount, key features, pros, and cons.
It’s never too late to get stronger.
About the Author: Stan Ferrell, R.Ph., MS, is a pharmacist and fitness enthusiast who successfully restarted his own strength journey after 40. He specializes in helping adults navigate training, nutrition, and gear with a focus on longevity and safety.
This article is for educational purposes only and is not medical or individualized nutrition advice. Protein needs vary by individual. If you have a medical condition, take medications, or are using a GLP-1 medication, discuss your nutrition and protein needs with your healthcare professional or registered dietitian. Health and Fitness Disclaimer