Losing Muscle After 40: 5 Signs Your Strength Is Slipping

"I'm not heavier, but I feel worse in my body." Dr. Sajad Zalzala hears some version of this a lot. Often the person thinks their metabolism has slowed down. Sometimes what's really changing is how much muscle they have.

Why muscle matters more than you think

Muscle isn't just about looks. It's one of the main places your body uses and stores the sugar from your food, and it gives you a buffer for stress, illness and getting older. With less muscle, your body has less room for error.

Muscle tends to shrink slowly with age, especially if you're less active. Because your weight may not change, it's easy to miss. Dr. Sajad Zalzala calls this a drift, because it creeps up over time.

5 signs your strength may be slipping

1. Everyday things feel harder, like carrying groceries, climbing stairs or getting up from a low chair.
2. You look or feel softer, even though your weight is about the same.
3. Workouts take longer to bounce back from.
4. You feel more tired than your day should explain.
5. You blame a slow metabolism, but you haven't changed your eating much.

None of these prove muscle loss on their own. Together, they're worth paying attention to.

What it isn't

• It isn't laziness.
• It isn't something you simply have to accept as "just aging."
• It usually isn't helped by eating much less and doing more cardio. Cutting food hard without any strength work can make muscle loss worse.

What to notice first

• A simple strength check. Count how many times you can stand up from a sturdy chair without using your hands in 30 seconds. Write it down and try again in a month. Only do this if it feels safe for you.
• Protein at meals. Does each meal include a protein food, like eggs, fish, chicken, beans, tofu or yogurt?
• Strength exercise. Most adults are encouraged to do some muscle-strengthening activity at least 2 days a week. MedlinePlus has a good starting guide on exercise for older adults.
• If you want numbers, a DEXA scan can measure your muscle and fat directly. It's optional.

Muscle loss often shows up alongside a growing waist. If that sounds familiar, read Why Am I Gaining Belly Fat After 40?

Your takeaway and next step

Your takeaway: Your weight can stay the same while your strength slips. Feeling weaker is a signal worth noticing, not a personal failure.

Your next step: Try the chair check this week and write down your number and the date. It gives you a simple starting point to compare against.

When to talk to a doctor

See a healthcare professional promptly for sudden weakness, weakness on one side of the body, falls, or weight loss you can't explain. If you have heart, joint or balance problems, ask your doctor before starting a new exercise routine.

Want to keep learning?

For more education and discussion about strength, energy, and healthy aging, you're welcome in the free Optional Aging community on Skool. Join the free community

Not sure where to start? Take the free DriversPulse assessment to see which areas may be affecting how you feel. It's free, with no cost to you. Take the free DriversPulse assessment

Want a doctor to look at the whole picture? With Healthspan Radar, Dr. Sajad Zalzala personally reviews your health story and any labs you choose to share. See how Healthspan Radar works

Educational information only. This article does not diagnose any condition or replace care from your own doctor.

Written by Dr. Sajad Zalzala, physician and founder of Optional Aging.