The Things That Affect Blood Sugar in Type 1 Diabetes (That People Don’t Believe)

There’s this quiet assumption about type 1 diabetes that it’s manageable in a simple way.

Count your carbs. Take your insulin. Move on.

But if you live it, you know that’s not just incomplete—it’s wildly inaccurate.

I was diagnosed at 2, so for 29 years I’ve been dodging all the things this disease tends to throw our way.

The thing I wish everyone knew was this: type 1 diabetes isn’t just about food. It’s managing a body that no longer regulates itself, while being expected to make hundreds of daily decisions with variables you cannot fully control. And most of those variables? People don’t even realize they exist.

It’s Not Just Food—It’s Biology Running the Show

Let’s start here: blood sugar is not controlled by willpower.

It’s influenced by a constant stream of internal processes—many of which happen whether you participate or not.

Hormones (the invisible drivers)

Your body releases hormones like cortisol, adrenaline, and growth hormone throughout the day. These hormones actively work against insulin, raising blood sugar even if you haven’t eaten and yes even if you pre-bolused like a pro.

This is why someone can go to bed with stable numbers and wake up high. Not because they did something wrong—but because their body decided to release glucose at 4am. IDK about you, but rude af, right?

Stress (yes, even the kind you can’t see)

Stress isn’t just emotional. It’s physical, mental, environmental.

• A busy workday

• A tough conversation

• Getting sick

• Even excitement

  
  

All of these can trigger a hormonal response that raises blood sugar.

And just to keep things interesting—stress can also cause lows for some people.

Same condition. Same person. Different response. Sometimes.. all within one lifetime. Your blood sugar can react one way for so many years and at the flip of a switch react completely different the next.

Sleep

One bad night of sleep can affect your entire next day.

Less sleep = more insulin resistance.

More insulin resistance = harder-to-control blood sugar.

So now you’re not just managing diabetes—you’re managing how well you slept, too. Grumpy and having to do math all day...0/10.

Caffeine

That black coffee with zero sugar? It can still spike your blood sugar.

Caffeine triggers adrenaline, which tells your liver to release stored glucose. So even when you’re doing everything “right,” your numbers can climb.

Exercise (this one confuses everyone)

We’re told exercise lowers blood sugar—and it can.

But high-intensity workouts can actually raise it. Why? Adrenaline again.

So now you’re making decisions like:

• “Will this workout drop me or spike me?”

• “Do I need insulin before I exercise?”

• “Do I need carbs instead?”

  
  

There’s no one-size answer. Just pattern recognition and experience. There was a very long time in my life that exercise made my blood sugar drop and then spike very quickly even before I had the chance to eat carbs.

Hydration, illness, and medications

Not drinking enough water can raise blood sugar. I try to drink more than what I think is necessary for the day with electrolytes. Water, for me helps fight ketones even on an off day.

Getting sick almost always messes with my sugars. The inflammation, weird eating and sleeping.. all make it really difficult to keep things under control.

Rule of thumb? Take note of how any medication- over the counter or not- affects your sugars! Sometimes they come with a label, so you can expect some craziness… but others have caught me by surprise.

Food (but not in the way people think)

Yes, carbs matter. But that’s just one piece of it.

• Protein can raise blood sugar hours later

• Fat can delay spikes (hello, pizza effect)

• The timing of when you eat can matter just as much as what you eat

  
  

So it’s not just “counting carbs.”It’s predicting the future.

If anyone has figured out take-out Chinese food, let a girl know please.

Timing, insulin absorption, and randomness

Insulin doesn’t work the same way every time. Yup. Even after 29 years, I’ve been violentally put in my place by my blood sugars.

.

I’ve learned it can vary based on:

• where you inject

• your body temperature

• scar tissue

• how active you’ve been

  
  

Even when you do the exact same thing two days in a row, you can get completely different results.

My favorite category, The “why TF is this happening right now?” moments

There are also the things that feel random—but aren’t:

• Blood sugar rising when you wake up, one foot out of bed and numbers rising with triple arrows.

• Numbers changing after a hot shower

• Hormonal shifts throughout the month

• Travel or routine changes

• OTHER DIAGNOSES

  
  

These aren’t mistakes. They’re physiology forcing your body to react another way.

But from the outside, they can look like inconsistency.

The Part No One Sees: Decision Fatigue

Now let’s layer all of that into real life. Because managing type 1 diabetes isn’t just about understanding these variables—it’s about constantly making decisions around them.

On average, people with type 1 diabetes make 180 to 300+ extra health-related decisions every single day. Not occasionally. Not when things go wrong. Every day.

What those decisions actually look like:

• Should I correct this number now or wait?

• Is this spike from food, stress, or hormones?

• Do I need insulin—or will that make me crash later?

• Can I go for a walk right now, or will I go low?

• Should I eat something before bed, or risk dropping overnight?

  
  

And those decisions don’t happen in a calm, controlled environment.

They happen in a meeting, driving, in the middle of the night, during important conversations, your every day ‘normal’ life.

The numbers behind the mental load

Continuous glucose monitors can update every 5 minutes.

That’s up to 288 data points a day.

Each one is a moment where you could:

• react

• second-guess

• intervene

• or decide to wait

And even then, there’s a margin of error.

Insulin absorption alone can vary by up to 20–50%.

So you’re making high-stakes decisions… with imperfect information.

The Truth That Doesn’t Get Said Enough

Type 1 diabetes is not just about discipline.

It’s not just about eating well.It’s not just about “taking care of yourself.”

It’s managing hormones you don't control, responses that change daily, a body that requires constant input, and decisions that never fully stop, all while trying to be present in your own life and those you love.

So, if you've ever felt like you're doing everything right and it still doesn't make ANY sense... you're not missing something. You are managing something so so complex.

Showing up for it every day- in ways a lot of people will never fully understand- isn't small.

To Me Love Me,

Lauren