Use It or Lose It: Protein, Strength, and the Muscle You Can't Afford to Lose

There is a slow, silent process happening in nearly every adult body, and almost no one notices it until it has already cost them something. Starting in our thirties, we begin to lose muscle — a little each year, quietly, without pain or warning. By the time it shows up as a wobble on the stairs, a struggle out of a low chair, or a back that tires by mid-afternoon, decades of erosion may have already occurred. The good news, and the reason I'm writing this today, is that this process is one of the most reversible things in all of human aging. Your body is listening for two signals — and you control both of them.

I see this in my Bernardsville office constantly. A patient comes in for back pain, knee trouble, or balance concerns, and underneath the presenting complaint is a body that has slowly given up muscle it desperately needs. Muscle isn't just for looking strong or lifting heavy things. It is the scaffolding that protects your spine, the shock absorber for your joints, the engine of your metabolism, and — as we age — one of the single best predictors of whether you'll stay independent and out of the hospital. Let's talk about how to keep it.

The Quiet Math of Muscle Loss

The medical term for age-related muscle loss is sarcopenia , from the Greek for "poverty of flesh." Here's how the arithmetic works: after age 30, most adults lose somewhere between 3% and 8% of their muscle mass per decade. That may sound small, but it compounds. The rate of loss tends to hold steady through your forties and fifties, then accelerates after 60 . By the eighth decade of life, a person who has done nothing to fight back can lose up to half of their muscle mass.

• 3–8% — muscle lost per decade after age 30
• ~50% — muscle mass that can be lost by the 80s
• 11–50% — of adults over 80 affected by sarcopenia

Why does this matter so much beyond aesthetics? Because muscle is functional insurance. Strong legs and hips keep you from falling — and falls are the leading cause of injury-related death in older adults. A strong core and back protect your spine through every bend, lift, and twist. Muscle is also your largest reservoir of amino acids; when you're sick or injured, your body draws on it to heal. Lose too much, and recovery from even a minor illness becomes a steep climb. This is why I tell patients that building muscle in your fifties and sixties is one of the highest-return investments you can make in your future self.

Signal One: Protein (And Why the Old Rules Are Too Low)

Muscle is built from protein, and here's a truth that surprises most people: the official protein guidelines were designed to prevent deficiency , not to optimize strength and aging. The standard RDA of 0.8 grams of protein per kilogram of body weight is the bare minimum to keep a sedentary young adult from wasting away. It is almost certainly not enough for an active adult, and it is clearly too low for anyone over 60.

Current research points toward a target of roughly 1.0 to 1.2 grams per kilogram per day for healthy older adults , climbing to 1.2 to 1.5 g/kg for those who are very active, recovering from illness, or already showing signs of muscle loss. For a 160-pound (73 kg) person, that's roughly 88 to 110 grams of protein per day — meaningfully more than most people eat.

• It's Not Just How Much — It's When — Your muscles can only use so much protein at once to build new tissue. Rather than eating most of your protein at dinner (the typical American pattern), spread it across the day. Research suggests aiming for 20–30 grams of protein per meal to fully switch on muscle-building. There's also a key amino acid called leucine that acts like an ignition switch for muscle synthesis. Hitting roughly 2.5–3 grams of leucine per meal — the amount in about 30g of high-quality protein — has been linked in 2025 research to measurably better grip strength and walking speed in older adults.

Where to Get Quality Protein

• 🥩 Fish & Seafood — Salmon, sardines — protein plus omega-3s
• 🥘 Eggs & Dairy — Greek yogurt, cottage cheese, eggs
• 🍗 Lean Poultry & Meat — Chicken, turkey, lean cuts of beef
• 🍄 Plants — Lentils, beans, tofu, edamame

If you eat mostly plant proteins, you simply need a little more total volume and variety, since plant sources tend to be lower in leucine. Combining sources across the day — lentils, tofu, edamame, and a scoop of pea or whey protein — closes the gap easily.

Signal Two: Resistance (The Part Protein Can't Replace)

Here's the part people most want to skip, and it's the one that matters most: protein only builds muscle when there's a demand for it. Eating more protein without challenging your muscles is like delivering bricks to a construction site where no one is building. The demand signal is resistance training — asking your muscles to work against a load. This is the single most powerful, evidence-backed tool we have to slow, stop, and even reverse sarcopenia at any age. Studies of adults in their seventies, eighties, and even nineties show meaningful strength gains within weeks of starting.

• Weeks 1–2 · Wake the system up — Bodyweight basics: sit-to-stands from a chair, wall push-ups, step-ups. Two short sessions a week is enough to begin.
• Weeks 3–6 · Add load — Introduce light dumbbells or resistance bands. Aim for movements that work the big muscle groups: legs, hips, back, and chest.
• Weeks 7–12 · Progress gradually — Slowly increase weight or repetitions. The principle is progressive overload — always nudging the demand a little higher.
• Ongoing · Make it a habit — Two to three sessions a week, for life. Pair each session with a protein-rich meal within a few hours.

How Worried Should You Be? A Quick Self-Check

You don't need a lab to gauge your muscle health. Pay attention to these everyday signals:

• On track: You rise from a low chair without using your hands and climb stairs without holding the rail.
• Worth attention: Carrying groceries tires you quickly, jars are harder to open, or your walking pace has noticeably slowed.
• Act now: You've had unexplained falls, struggle to stand from a seated position, or feel measurably weaker year over year.

Weakening grip strength is one of the most reliable early warning signs — it correlates with overall body strength and even longevity. If opening jars and bottles has become a noticeable chore, treat it as a useful nudge rather than just an annoyance.

• 💡 Dr. Don's Takeaway — Muscle is the one tissue you can rebuild at almost any age — but only if you give it both signals. Eat enough protein, spread across your meals, and ask your muscles to work against resistance a few times a week. Do those two things consistently and you won't just look stronger; you'll protect your spine, your joints, your balance, and your independence for decades to come.

The Spine Connection

As a chiropractor, I care about muscle for a very specific reason: your spine is only as stable as the muscles that support it. The deep core, the glutes, the muscles running alongside your vertebrae — these are what hold you upright and absorb the forces of daily life. When they weaken, your joints and discs take the load instead, and pain follows. Strengthening your body is not separate from caring for your spine; it is caring for your spine. That's why a well-rounded plan often combines chiropractic care to keep your joints moving freely with the strength work that keeps them supported.

• Build Strength That Lasts a Lifetime — At AHPTS in Bernardsville, we help you build a body that holds up — combining spine care with practical guidance on movement, strength, and nutrition tailored to you.

This article is for educational purposes and is not a substitute for individualized medical advice. Talk with your healthcare provider before beginning a new exercise or nutrition program, especially if you have existing health conditions.