If you search “what does 5 pounds of fat look like,” you’ll find no shortage of results — images of that squishy, yellowish blob of tissue that’s become a staple of fitness motivation posts. Same with muscle: search “5 pounds of muscle” and you’ll get side-by-side comparisons, 3D renders, the works. People love a visceral visual.

Try searching “what does 5 pounds of carbs look like,” though, and… not much. It’s a weirdly hard question to find a straight answer to, which is part of why I wanted to write this.

Because it turns out that 5 pounds of carbs isn’t really a thing you can photograph. It’s not sitting anywhere waiting to be measured. It’s a process — one that plays out in your muscles, your liver, and your water retention — and understanding it completely changed how I think about the scale.

Your Body Is a Glycogen Warehouse

When you eat carbs, your body breaks them down into glucose and stores the excess as glycogen — basically a long-chain form of sugar that your muscles and liver can quickly tap for energy.

Here’s how much your body can hold:

  • Muscles: ~400 grams of glycogen
  • Liver: ~100 grams of glycogen
  • Total: roughly 500 grams, or a little over a pound

That’s it. Half a kilogram. Your carb tank isn’t enormous — it’s actually more like a sprint reserve than a long-haul fuel tank.

So Where Are the Other 4 Pounds Coming From?

Water. Always water.

Every gram of glycogen requires about 3–4 grams of water to store it. Your body doesn’t just tuck the glycogen away dry — it needs water molecules to pack it properly in your muscle fibers.

Do the math:

  • 500g of glycogen × 3g of water = 1,500 grams of water
  • 500g + 1,500g = 2,000 grams total — about 4.4 pounds

Fill your glycogen tank completely after a low-carb stretch, and you can legitimately see the scale go up 3–5 pounds overnight without a single gram of actual fat being added to your body.

What Does 500g of Carbs Actually Look Like?

This is the part that always surprises people. Your entire carb-storage capacity is filled by something like:

  • 3 cups of cooked pasta (about 120g carbs) + a couple slices of bread + a banana + some crackers — and you’re basically there
  • Or roughly 5 medium potatoes
  • Or 8–10 cups of cooked rice (though good luck eating that in a day)

That’s not a binge. That’s a normal Tuesday for a lot of people. The body’s glycogen capacity is designed to be filled — it’s supposed to be your go-to energy source.

The Heart Rate Zone Wrinkle

This is the part I wish someone had explained to me years ago.

For a long time, I ran hard. Like, actually hard — and I couldn’t figure out why the visual results didn’t always match the effort. I’d have weeks where I was pushing myself and the scale barely moved, or moved in the wrong direction. I wrote a little about this when I first got into Zone 2 training — I didn’t spell it out explicitly at the time, but the missing piece was this: the harder you work out, the more carbs you burn — not fat.

In lower-intensity zones (Zone 1 and 2 — a comfortable jog where you can hold a conversation), your body leans heavily on fat for fuel. Push into Zone 3 or Zone 4 — that moderately hard effort where breathing gets real — and you shift toward burning glycogen fast. You might burn more total calories in that harder session, but a larger chunk of them are coming from your carb stores, not your fat stores.

What that means practically: a hard run depletes your glycogen, the scale ticks down a bit, you refuel with carbs, and the scale pops right back up. You worked harder and have nothing to show for it on the scale. But you’re not going backwards — you’re just watching your glycogen tank cycle through, which is exactly what it’s designed to do. The fat-burning work, if that’s a goal, often happens at the lower intensities that feel almost too easy to count.

The Actual Takeaway

The scale isn’t measuring your worth. It isn’t even measuring your fat. On any given day, it’s mostly measuring:

  1. What you ate and drank
  2. How depleted or full your glycogen stores are
  3. How much water your body is holding to manage all of the above

Five pounds on the scale after a good carb day isn’t failure — it’s your body working exactly like it’s supposed to. It took on fuel, stored it efficiently, and is ready to use it.

That’s something worth appreciating, not panicking about.

Further reading:

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