The Rule of 15 (And Why We Ignore It)
Everyone with type 1 diabetes has heard of the Rule of 15. Treat a low with 15 grams of fast-acting carbs, wait 15 minutes, and recheck. Simple. Logical. Universally ignored. In this episode, we break down why the Rule of 15 sounds great...
The episode, word for word
Raise your hand if you've ever heard of the Rule of 15.
Now keep your hand up if you actually follow it.
Yeah. That's what I thought.
The Rule of 15 is one of those things everyone knows about, like changing your oil every 3,000 miles. And let's be honest, I've let my car go three times that. 10,000 miles? Badge of honor.
We know we're supposed to do it. But when the moment comes? We panic. We override it. And we end up right back on the blood sugar roller coaster.
Today, we're gonna talk about what the Rule of 15 actually is, why it works, and why almost nobody follows it.
I'm Neil Greathouse, and this is Your Best T1D Year.
Welcome to Friday. This is the end of Week 1, and we've been building the case all week for why the way you treat lows matters.
Today, we're talking about the Rule of 15. And if you've never heard of it, don't worry, I'm gonna explain it. And if you have heard of it but you ignore it every single time you're low? Don't worry. You're not alone.
Let's break it down.
Here's the Rule of 15 in plain English:
When your blood sugar drops below 70 mg/dL, you treat it with 15 grams of fast-acting carbohydrates. Then you wait 15 minutes. Then you check your blood sugar again. If you're still low, you repeat: another 15 grams, another 15 minutes, another check.
That's it. Simple. Straightforward. Backed by decades of research and clinical practice.
So why don't we do it?
Because when you're low, 15 minutes feels like forever. And 15 grams feels like nothing. Your body is screaming at you to eat. Your hands are shaking. Your brain is foggy. And every instinct you have is telling you that if you don't eat right now, you're going to pass out.
So you eat. And then you eat more. And then 20 minutes later, you're 250 mg/dL, and you're wondering what the hell just happened.
Here's the science behind the Rule of 15:
15 grams of glucose raises your blood sugar by approximately 50 mg/dL in most adults. That's the average. If you're at 55 mg/dL, 15 grams should get you to around 105. Safe. Stable. Not high.
But here's the part that trips people up: It takes time for that glucose to actually hit your bloodstream. Recent research shows it's often closer to 19 or 20 minutes, not 15. Even with automated insulin delivery systems that suspend insulin when you go low.
Your stomach has to process it. Your liver has to release stored glucose. Your brain has to recalibrate and realize that yes, you're safe now, you can stop panicking.
And if you eat more before that glucose kicks in? You're stacking carbs on top of carbs. And all of them are going to hit your bloodstream eventually. That's why you end up high.
The Rule of 15 isn't arbitrary. It's not a suggestion. It's literally how your body processes glucose. The problem is, we don't trust it.
So why do we ignore the Rule of 15?
Because it feels wrong.
When you're low, your body goes into full-on survival mode. Your sympathetic nervous system kicks in. Your adrenal glands dump adrenaline and cortisol into your bloodstream. Your heart races. Your hands shake. Your brain sends you one message, over and over: "EAT. NOW. EVERYTHING."
And when you take 15 grams of glucose and sit down to wait, your brain doesn't believe it's enough. It doesn't feel like enough. You still feel shaky. You still feel sweaty. You still feel like you're dying.
So you override the rule. You eat more. And then you end up high. And then you're mad at yourself for not following the rule. Again.
But here's the thing: The rule works because it feels wrong. It works because it forces you to slow down. To trust the process. To give your body the time it needs to do its job.
And yeah, that's hard. It's really hard. Especially in the moment.
But that's exactly why it matters.
You know that scene in The Empire Strikes Back where Luke is training with Yoda, and he's trying to use the Force to lift his X-wing out of the swamp? And he says, "I'll try."
And Yoda stops him. "No. Try not. Do, or do not. There is no try."
Luke doesn't believe it's possible. So he gives up. And then Yoda lifts the entire ship out of the water himself.
That's the Rule of 15. You don't believe 15 grams is enough. You don't trust the process. So you override it before it has a chance to work.
But the rule works, if you let it.
Here's what I want you to think about this weekend:
"What am I afraid will happen if I only take 15 grams and wait?"
Are you afraid you'll stay low? Are you afraid you'll pass out? Are you afraid the glucose won't work?
Just notice the fear. Because once you see it, you can start to work with it.
By the way, if you're just joining us, welcome. This is Week [X] of the Low Blood Sugar Challenge. For the next eight weeks, we're gonna completely change the way you treat lows. Not just what you eat, but how you think about it.
And yeah, it's gonna feel uncomfortable at first. But that's the point.
If you want to join the challenge, head to yourbestt1dyear.com. Sign up. Get the guide. And follow along. We're doing this together.
Next week, we're shifting gears. Monday's a guest episode, I'm bringing in someone who's gonna blow your mind. Wednesday, we're talking about the snack you don't deserve. That one's gonna get real. And Friday, we're diving into the weight you didn't know you were gaining.
By the end of next week, you're gonna be ready. Ready to try something different. Ready to break the pattern.
Stick with me.
Before we wrap up, let me leave you with something that really stuck with me, 70% of counties don't have an endo. One in four people delay insulin. It shouldn't be this hard to stay alive. Blue Circle Health is proving that it doesn't have to be. From tech support and emotional coaching to prescriptions and beyond, they're flipping the system on its head. Free care. Real support. Available in 20 states plus Washington DC. Go to bluecirclehealth.org.
Type 1 diabetes is relentless, but managing it doesn't have to be. New episodes drop every Monday, Wednesday, and Friday. You're building something stronger than you realize. Keep going.
// Year 33 Day 12396 #YourBestT1DYear
Week 48
Jan 12 - 143 Guest
Jan 14 - 144
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.