You're Not Over Fat. You're Under-Muscled.

Craig McBreen • August 17, 2026

For years I chased all the wrong things.

I ran more. I ate less. Then I hit the treadmill.

I yo-yo dieted. My lower back pain got worse. I went from fat to skinny fat, and I kept running anyway.

I did this on and off through my 40s. Tired. Soft.

I was convinced the problem was calories, so I fought fat with more miles and steeper treadmill inclines.

I lost that fight every time.

Why?

I put in the work. I just picked the wrong problem to fix.

Turns out somebody has this whole thing figured out…

The Muscle-Centric Way

Dr. Gabrielle Lyon built the Muscle-Centric Medicine framework. Her methods line up with what changed my body in my 50s.

Her argument is simple. The medical world has spent fifty years fighting obesity when obesity was never the root problem. It's the symptom.

The root problem is that people don’t have enough skeletal muscle. And the muscle you do have isn't doing its job.

Obesity is a downstream symptom of low muscle mass, not the core disease.

While mainstream medicine views obesity as a serious issue (and I agree), Lyon’s muscle-first take shifts the focus from just losing fat to gaining metabolic health.

This was the mindshift that changed my life.

Here's what that means in plain terms:

Muscle is the body's biggest sink for blood sugar. When you eat, most of that glucose is supposed to get pulled out of your blood and stored in muscle tissue.

But a small, underworked muscle can't clear it. When overeating and muscle inactivity pack your cells with too much energy (sugar and fatty acids), the cells "lock their doors" to protect themselves from the overload.

They ignore insulin, leaving sugar trapped in your bloodstream. Your body then has no choice but to convert this stranded blood sugar into body fat.

Read that again… This cellular resistance, not your lack of willpower, is how fat accumulates.

You are not over-fat. You are under-muscled.

Fat builds up because the muscle that should be clearing blood sugar, burning fat, and driving your metabolism isn't doing its job.

Chase the fat number, and you're treating a symptom while the actual organ of longevity (MUSCLE) keeps shrinking.

I believed this before I knew what the heck to call it.

Now, I'll admit this isn’t only about muscle. Genetics, hormones, sleep, stress, and poor food choices all play a role. Dr. Lyon isn't claiming otherwise.

BUT… her single focus is the most useful: of everything on that list, muscle is the one you can actually control.

Your muscle-building plan

Lift hard. Prioritize protein. Play the long game.

Two or three full-body sessions a week, 30–45 minutes. Squats, deadlifts, presses, rows, the moves that work the most muscle for the least time. Start light, add weight as you go.

Protein at every meal, roughly a gram per pound of your target weight, with the first meal carrying the most.

Lyon makes a point I wish someone had told me when I was 45… Your first meal of the day sets the tone. Skip protein at breakfast, and you spend the rest of the day playing catch-up. Lead with protein, and you're building from the first hour.

Playing the long game means treating this as a ten-year project, not a six-week fix. The people who build aren't the ones who go the hardest. They're the ones who’ve built a fitness habit and are still lifting two years later.

That's the plan. No 40+ supplements. No diet obsession. No endless cardio.

Want the full breakdown? I wrote up the five steps here.

The GLP-1 warning nobody wants to hear

GLP-1 medications are everywhere, and the weight comes off fast. But without resistance training, a meaningful share of that weight is muscle, not fat.

Keeping muscle in your 40s, 50s, or 60s is already a challenge. Add a GLP-1 and your battle gets even harder. You're smaller, weaker, slower to recover, and more fragile.

We may be trading the obesity epidemic for a muscle loss epidemic.

So you can win the scale but lose the war.

Why I'm telling you this

I agree with Dr Lyon, and I lived this before GLP-1s existed. Weight loss, muscle loss, the skinny-fat cycle. And my endless cardio obsession… but lifting changed my body and my life.

I got certified as a coach at 59 because I was sick of watching men my age get handed programs built for someone half their age. Programs obsessed with calories burned, not the power of Muscle-Centric Medicine.

At 62. I'm leaner and stronger than I was in my 30s and 40s. Not because I beat fat. Because I finally started building muscle instead of fighting weight.