MUSCLE = METABOLISM · LESSON 2 OF 4

Muscle is not a furnace. It's a bank.

Hi Klop,

Last week I told you your metabolism didn't slow — your body composition changed. Today, what muscle is actually doing all day, because the version you've been sold is the least interesting third of it.

Here's the one you know. Muscle burns calories at rest. That is true. It is also small: somewhere between six and ten calories per pound per day. Put on five real pounds and you have earned yourself thirty to fifty calories a day. Real, worth having, and nowhere near the reason to do this.

Here’s the deal. When I look at muscle, I see three things.

One. It is your metabolic Spanx. It holds everything in tighter, and it is the only way you can meaningfully change your resting metabolic rate. Not a cleanse, not a supplement, not a diet. Tissue.

Two. It is a sugar sponge. When you eat carbohydrates, that glucose has to go somewhere. Skeletal muscle handles roughly eighty percent of the insulin-driven glucose disposal in your body. It gives carbohydrates a great place to land instead of being stored as fat. Lose muscle for twenty years and you are running the same meals through a much smaller sponge — which is the 3pm crash, and the cravings that feel like a character flaw.

Three. It is a multitasking messenger. Contracting muscle releases signaling molecules called myokines that help improve insulin sensitivity and talk to your fat tissue, your immune system and your brain. Your muscle is an endocrine organ. It participates in your health. It does not just hold up your skeleton.

And underneath all three, muscle is a reserve. What it banks is amino acids from dietary protein — the material your body draws on to repair, to fight infection, to recover from a fall or a surgery. That reserve is the one you cannot buy back quickly at seventy.

Muscle matters because it burns calories all day.

Muscle burns, sponges and signals. The burning is the smallest of the three.

This is also why the scale is such a bad witness. You can add muscle, lose fat, look and feel dramatically better, and watch the number barely move — because you improved the machine, not the mass. More on that in two weeks.

WHAT THIS MEANS FOR YOU

Your afternoon crash may be a storage problem, not a willpower problem.
Building muscle changes how every future meal behaves in your body. That's leverage nothing else gives you.
A bigger sponge means more room for the food you love. This is an expansion strategy, not a restriction strategy.

DO THIS WEEK

After your largest meal, take a ten to twenty minute walk. Short on time? One minute of air squats does the same thing. Contracting muscle pulls glucose out of your blood through a pathway that does not even require insulin. You are wringing out the sponge on purpose.

HOW I MAKE THIS EASY

Building any of this requires raw material, and the raw material is protein carrying the right amino acids. Our shakes are boosted with additional amino acids specifically to match the amino acid profile of whey — the protein everything else gets measured against — without the dairy. With under a gram of sugar, you are feeding the muscle without flooding the sponge.

NEXT TUESDAY

The protein advice you have been given is half right. There is a number that matters more than timing, and a trigger that matters more than either.