One of the most frustrating things about Type 1 diabetes is that insulin and carbs are only part of the equation.

Your body has like 6 other hormones that mess with your blood sugar. And most of them are working against you.

Here's what's actually going on:

Insulin (the only one that lowers BG)

• What it does: Tells your cells to absorb glucose from your blood
• Why it's released: In response to eating (or in our case, when we inject it)
• The problem: We're the only ones managing this one manually

Glucagon (raises BG)

• What it does: Tells your liver to dump stored glucose into your bloodstream
• Why it's released: When your body senses low blood sugar
• The irony: Your body's "rescue system" for lows can overshoot and cause highs

Cortisol (raises BG)

• What it does: Makes your body more insulin resistant and triggers glucose release
• Why it's released: Stress, poor sleep, inflammation, or just waking up (dawn phenomenon)
• The problem: Stressful day at work? Your BG is going up even if you didn't eat anything

Adrenaline/Epinephrine (raises BG)

• What it does: Rapidly dumps glucose into your blood for quick energy
• Why it's released: Fight-or-flight response, intense exercise, or even just being nervous
• Real-world translation: Job interview? Argument with your spouse? Your BG just spiked

Growth Hormone (raises BG)

• What it does: Reduces insulin sensitivity and promotes glucose production
• Why it's released: During deep sleep, exercise, and recovery
• Why this matters: This is part of why you can go to bed at 120 and wake up at 180 without eating anything

Estrogen & Progesterone (both, depending on levels)

• What they do: Affect insulin sensitivity throughout your menstrual cycle
• The chaos: Estrogen can make you more insulin sensitive (lower BG). Progesterone does the opposite (raises BG). They fluctuate all month.
• Real talk: This is why some women with T1D have wildly different insulin needs during different weeks of their cycle

Testosterone (can affect both)

• What it does: Higher levels generally improve insulin sensitivity (lower BG), but it's complicated
• Why it matters: Can affect insulin needs, especially as levels change with age or if you're on hormone therapy

Here's the kicker: You can only directly control one of these (insulin).

The rest are just doing their thing in the background. Responding to stress, sleep, exercise, time of day, illness, your menstrual cycle, whether you got cut off in traffic.

This is why you can do the exact same thing two days in a row and get completely different results.

Thanks a lot biology.

And it's also why managing diabetes is so much more than just "matching your insulin to your carbs."