Why Food Beats Insulin to the Finish Line | Pre-Bolus Science, T1D
Half the planet is watching the World Cup, so Neil explains the mechanism of the post-meal spike in soccer terms. Your food is the striker, already past the defense. Your insulin is the defender who got subbed in late and is still jogging...
The episode, word for word
Half the planet is watching the World Cup right now, so put on your imaginary scarf, because we're doing this in soccer terms.
Your food is the striker. Lightning fast, already behind the defense, one touch from the back of the net, absolutely cooking. Your insulin? Your insulin is the defender who got subbed in late, jogging back at a concerning pace, one hand in the air, yelling "I've got him! I've got him!" He does not have him. He has never had him. He's going to pull a hamstring just watching the replay.
That mismatch, right there, is the entire reason you spike. Today I finally tell you why. You earned the why.
I'm Neil Greathouse, this is Your Best T1D Year, and we have officially crossed over from "why we don't" to "how this thing actually works."
So here's the deal with your insulin, and I'm going to say a fancy science word and then apologize for it immediately. Pharmacokinetics. Four syllables that mean "how fast the drug works." That's it. Somebody in a lab coat needed four syllables of job security, and honestly, respect. We're going to say "how fast it works" and live our lives.
Here's how fast it works. Most of us are on regular rapid-acting insulin. Humalog, Novolog, the greatest hits. And that stuff takes about 15 minutes just to clear its throat and start, peaks around an hour, and hangs around the party for three to four hours like a guest who did not see anyone else grabbing their coat. Your food, meanwhile, especially dinner carbs, rice, bread, pasta, the glorious starchy royalty, that stuff hits your bloodstream almost immediately. No warm-up. No stretching. Just gone.
So look at the gap. Your carbs are already past midfield, one-on-one with the keeper, doing that little stutter-step. Your insulin is still on the bench, still tying one cleat, still asking the coach "wait, am I in?" By the time it trots onto the pitch, the carbs have already scored, ripped their jersey off, slid across the wet grass on both knees, and gotten a yellow card for excessive celebration.
That gap is the spike. That's your 240. The carbs got a head start and your insulin showed up at halftime asking what the score was.
And here's the beautiful part, the part that makes this whole challenge work. You just put your insulin in the game first. Let it leave a few minutes early, do its slow little warm-up jog, and then send the food in. Now they're matched. They arrive together. No breakaway. No spike. Just a flat, boring, gorgeous line.
And flat and boring, in type 1, is the dream. A boring CGM is a beautiful CGM. A boring CGM is a spa day for your whole nervous system. It's the lo-fi-beats-to-relax-and-study-to of blood sugar. Nothing happening. Just vibes. Perfect. I would frame a boring CGM. I would hang it in the hallway.
That's the mechanism. Same dose, same dinner, you just send the insulin out before the food instead of jogging them out together and hoping.
Your challenge this week, still your dinner lab. Keep watching that gap between your dose and your first bite. But now you know what it means. Every minute your insulin's behind, the food is loose on a breakaway with nobody back on defense. Just notice it. We're one week from actually doing something about it.
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Here's the honest truth about the science. It does not care whether you believe it. Move the clock, the number drops, whether you trust me or whether you think I'm just a guy with a microphone and a lot of opinions. So you might as well test it on your own dinner and watch it happen with your own two eyes.
I'm Neil. Friday, the proof. Actual studies. Actual numbers. See you then.
This is the script as read on the mic, lightly tidied for reading. Education, not medical advice. Talk to your care team before you change anything about your insulin.