Sarcopenia is the loss of muscle mass and strength that comes with age. It starts earlier than most people think. Muscle loss begins after your thirties and continues for the rest of your life.
Most adults lose 1 to 2 percent of their muscle each year. In older adults that can reach 3 percent a year. By age 80, half of your muscle can be gone.
This is not about how you look. Muscle keeps you steady on your feet, helps control your blood sugar, and keeps you independent. Losing it raises your risk of falls, frailty, and early death.
Signs You May Be Losing Muscle
Sarcopenia is quiet at first. You may notice:
- Stairs feel harder than they used to
- You tire faster doing normal chores
- Your grip feels weaker, like opening a jar
- You walk more slowly than you did
- You lost weight but feel softer, not firmer
- You feel unsteady, or you have had a fall
Many people blame these on getting older. Often they are signs of muscle loss, and muscle loss can be treated.
Why Muscle Matters More Than You Think
Muscle does more than move you. It is the largest place your body stores blood sugar. When you lose muscle, sugar has fewer places to go, so blood sugar climbs. This is one reason muscle loss and type 2 diabetes often show up together.
Muscle also protects you when you get sick. People with more muscle tend to recover better from surgery, infections, and hospital stays.
What Causes Sarcopenia
Age is only one cause. Others include:
- Not enough protein. Many adults eat most of their protein at dinner and very little at breakfast.
- Too little resistance exercise. Walking is good for your heart, but it does not build much muscle.
- Low hormones. Testosterone, estrogen, and thyroid hormone all help you keep muscle.
- Long illness or bed rest. Muscle is lost quickly when you cannot move.
- Fast weight loss. When weight drops quickly, part of that loss is muscle.
- Ongoing inflammation. Chronic inflammation breaks muscle down over time.
Weight Loss Medications and Muscle
Sarcopenia is not only caused by aging. Losing weight quickly on a GLP-1 medication like semaglutide or tirzepatide can also play a large role.
These medications work well. But if you lose weight fast and do not eat enough protein or lift anything heavy, a large share of what you lose can be muscle instead of fat. You may weigh less and still be weaker than before.
This is why we track more than the number on the scale. We watch your strength and your body composition while you lose weight, and we adjust your plan if muscle starts to drop.
How Much Protein You Need
Aim for 20 to 35 grams of high-quality protein at each meal. Spreading it through the day works better than eating it all at once.
Good sources include eggs, fish, chicken, lean beef, Greek yogurt, cottage cheese, and beans. If you cannot reach that much at a meal, a protein or amino acid supplement can help fill the gap.
Exercise That Rebuilds Muscle
Resistance training is the strongest tool you have. That means working against weight: dumbbells, machines, resistance bands, or your own body weight.
Two or three sessions a week is enough for most people. Work the large muscles of your legs, hips, back, and chest. Add a little weight or a few more repetitions over time.
Stay active the rest of the week too. Walking, gardening, and stairs all help you keep what you build.
How We Check for Muscle Loss
We look at grip strength, how fast you walk, and how your body composition changes over time. We also check labs that affect muscle, including thyroid, testosterone or estrogen, vitamin D, and markers of inflammation.
When one of those is off, correcting it makes your diet and exercise work much better.
The Good News
Muscle responds at any age. Adults in their seventies and eighties gain strength with resistance training and enough protein. You are not stuck with the muscle you have today.
Where to Start if You Are Out of Shape
If you have not trained in years, start smaller than you think. Two sessions a week, six or eight exercises, one or two sets each. Sit-to-stands from a chair, a step-up, a push against a wall, and a row with a band cover most of what you need.
Soreness in the first weeks is normal. Joint pain is not, and it means the movement or the load needs changing rather than pushing through.
Protein Timing for Older Adults
As you age, your muscles respond less readily to protein. It takes a larger amount at one sitting to trigger the same muscle-building signal.
That is why we push for 25 to 35 grams at a meal rather than spreading small amounts through the day, and why breakfast matters. A typical breakfast of toast and coffee contributes almost nothing toward keeping your muscle.
We see patients by telehealth across Washington and Idaho from our clinic in Spokane. If you are losing weight, feeling weaker, or want to protect your strength as you age, book a free 15-minute call and we will talk through where to start.