Tommy's Take by Tommy Pomatico 7/6
The Only Muscle Equation You Need to Understand
Most people think building muscle is about "working out hard" and "eating protein." That's not wrong, but it's vague enough to keep you spinning your wheels for years. If you want to actually understand why some people build muscle and others don't, it comes down to a single tug-of-war happening in your body every hour of every day.
It's called protein balance. And once you get it, everything about training and nutrition starts to make sense.
Muscle Is Always Being Built and Broken Down
Your muscle isn't a static thing you slowly add to like bricks on a wall. It's constantly being taken apart and rebuilt. Right now, as you read this, two opposing processes are running:
Muscle Protein Synthesis (MPS) — your body building new muscle protein.
Muscle Protein Breakdown (MPB) — your body tearing down existing muscle protein.
Both are happening all the time. This is normal and healthy. Breakdown clears out damaged proteins; synthesis replaces them with fresh ones. Your muscle is being remodeled around the clock.
What matters for growth is not whether these processes happen — it's which one wins.
Net Balance: The Whole Game
Subtract breakdown from synthesis and you get your net protein balance:
MPS − MPB = Net Balance
When MPS is higher than MPB, net balance is positive. You're gaining muscle.
When MPB is higher than MPS, net balance is negative. You're losing muscle.
When they're equal, you're holding steady.
That's it. That's the equation your entire physique is built on. To grow, you need to spend more total time in a positive balance than a negative one. Everything you do in the gym and the kitchen is really just an attempt to tip this seesaw toward synthesis and keep it there as long as possible.
Why You're Losing Muscle Right Now (and Why That's Fine)
Here's the part most people miss: for big chunks of the day, your net balance is negative — and that's completely normal.
When you're fasted — first thing in the morning, or several hours after your last meal — you don't have much amino acid coming in. With no raw material to build from, synthesis drops and breakdown climbs. Net balance goes negative. Your body is quietly borrowing from muscle to keep the rest of the system running.
This isn't a problem on its own. The problem is only if you stay in that state and never swing back the other way. Muscle loss during fasted windows is meant to be paid back — with interest — during fed, well-trained windows. If you never create those positive windows, the losses just pile up and you slowly shrink.
The Two Levers That Flip You Positive
You have two powerful tools to drive MPS above MPB. Use both.
1. Eat Protein
When you eat a meal with quality protein, blood amino acid levels rise. One amino acid in particular — leucine — acts like a switch that turns synthesis on. Within an hour or two of a solid protein meal, MPS spikes above breakdown and you're in positive territory.
The catch: this spike doesn't last forever. It ramps up, peaks, and comes back down over a few hours, even if amino acids are still floating around. This is why how you spread protein across the day matters, not just the daily total. A single giant protein bomb at dinner flips you positive once. Several well-sized protein meals flip you positive several times.
2. Lift Weights
Resistance training is the other lever, and it's the one that makes the food actually matter. A hard training session sensitizes your muscle so that when protein comes in, the synthesis response is bigger and lasts longer. Even better, training elevates your muscle's sensitivity to protein for roughly 24 to 48 hours afterward.
Food raises MPS. Training raises how hard food raises MPS. Combine them and you get the strongest, most sustained positive balance available to you.
What This Means for a Normal, Busy Person
You don't need to be a competitive bodybuilder to use this. You need to structure your day so you spend more time positive than negative. Here's how that translates:
Hit enough total protein. Aim for roughly 0.7 to 1 gram per pound of bodyweight per day. This is the raw material. Without it, nothing else works.
Spread it out. Instead of one or two big protein hits, aim for 3 to 4 meals each containing a real serving of protein — think 30 to 45 grams. Each one is another swing into positive balance. Front-loading some protein earlier in the day also helps you climb out of that overnight fasted dip sooner.
Lift 2 to 4 times per week. You don't need marathon sessions. You need consistent resistance training that gives your muscle a reason to keep synthesis elevated. This is the piece that turns your protein into muscle instead of just fuel.
Don't fear the fasted windows. Skipping breakfast or fasting overnight won't wreck you. The negative balance during those windows is normal and gets repaid the moment you train and eat well. What matters is the full 24-hour picture, not any single hour.
The Bottom Line
Building muscle isn't complicated once you see the mechanism. Your body is always synthesizing and breaking down muscle. Growth happens when synthesis wins more often than breakdown does across the whole day and week.
Two levers flip you positive: eating quality protein and training with resistance. Pull both, consistently, and structure your day so the positive windows outweigh the negative ones.
You're not trying to stop breakdown — that's impossible and unnecessary. You're trying to make sure that over time, you build back more than you lose. Win that math often enough and the muscle takes care of itself.
