Close Banner

Integrative Health

A New Way to Fight Age-Related Muscle Loss — And It's Not Exercise

Author: Zhané Slambee

April 23, 2026

mindbodygreen editor

By Zhané Slambee

Image by Stocksy

April 23, 2026

As we get older, our muscle mass tends to decline (often referred to as sarcopenia). This is one of the biggest yet most overlooked challenges of aging. It raises the risk of falls1, fractures, and losing the ability to live independently. And right now, there's no medication approved to treat it.

But new research2 points to a surprising solution: blocking the receptor for ghrelin, the so-called "hunger hormone." Scientists found that turning off this receptor significantly improved muscle function in aging mice without changing muscle size or lifespan. Here's what you need to know, and what it might mean for human health.

The muscle problem no one's talking about

Sarcopenia usually starts around age 30, with muscle mass dropping 3 to 8% each decade. After 60, the decline speeds up. And while losing muscle mass is a problem, so is the loss of muscle function. That means less strength, less endurance, and getting tired more easily.

This matters because strong, functional muscles help us stay mobile, recover from illness, and handle everyday activities as we age. Weak muscles mean a higher chance of falling, slower healing, and needing more help with basic tasks.

Ok, so where does ghrelin come into this coversation?

The connection between ghrelin & muscle

Scientists looked at the ghrelin receptor (called GHSR-1a) and its role in age-related muscle decline. Ghrelin is a hormone that is released to tell us that we're hungry.

The study found that when scientists either removed or blocked this receptor in older male mice, it improved their muscle. They could exercise longer without getting tired, had better endurance, and were stronger overall. Importantly, their muscles didn't get bigger — they just worked better. And the mice lived just as long as before.

Interestingly enough, a drug called PF-5190457 (which blocks the ghrelin receptor) produced the same benefits. Mice given this drug also lost some body weight and fat, hinting at extra metabolic perks beyond just muscle improvement.

RELATED READ: 4 Habits That Help Get Ghrelin Under Control

The science behind it

So why would blocking a hunger-related receptor help muscles work better? It comes down to the mitochondria.

The researchers found that blocking the ghrelin receptor helped cells make more mitochondria, which is a process driven by a protein called PGC-1α. Why does this matter? Simply put, more mitochondria means more energy for your muscles. (This is also why mixing cardio and strength training is so good for your cells as both types of exercise boost mitochondria.)

On top of that, blocking the receptor improved the body's ability to clear out old, damaged mitochondria, just like taking out the cellular trash. When your cells can both build new energy factories and clean up the broken ones, your muscles perform better overall.

Where we go from here

This research was done in mice, not humans, so we can't draw conclusions about how it would work for people yet. Animal studies don't always translate to humans, and any potential treatment would need thorough safety testing first.

Still, these findings are promising. The ghrelin receptor is now on the radar as a possible drug target for age-related muscle decline, a condition that badly needs treatment options. Since the drug PF-5190457 already exists and showed positive results, it could speed up the path to human studies.

This research also shifts how we think about muscle aging. Instead of focusing only on muscle size, it highlights the importance of muscle function; and suggests we might be able to help muscles work better even without making them bigger.

RELATED READ: This Creatine Helps You Build Muscle & Strength Without The Bloat

The takeaway

While we wait for human trials, the best way to keep your muscles strong is still strength training. Resistance exercise remains the most effective tool we have for maintaining muscle strength, endurance, and overall health as we age and working often-overlooked muscle groups can offer extra protection.

2 Sources

- https://pubmed.ncbi.nlm.nih.gov/34652767/

- https://pubmed.ncbi.nlm.nih.gov/41986945/