The third variable is the one that makes pizza, nachos, and steak so confusing. They're not high-carb in the moment. They're high-impact hours later.
Today's idea
Most carb-counting frameworks were built for carbs. They don't talk about fat and protein well. But fat and protein are absorbed slowly — and they can produce blood sugar rises 3–6 hours after eating, when the original insulin bolus has long worn off.
The Pro Tip series has been teaching this for years:
Fat and protein don't show up in the first ninety minutes. They show up in hours three, four, and five — long after a normal bolus has worn off. The meal that looked fine at the two-hour mark can still produce a high at the four-hour mark, and it's not a failure of math. It's the food doing what the food does.
From Pro Tip 1012
For someone managing Type 1, this means a meal that didn't spike at the 90-minute mark can still produce a 200 at the 4-hour mark. It's not bad luck. It's not bad math at the meal. It's the meal's fat and protein doing exactly what they do. There are strategies — extended boluses, split doses, temp basal increases — that the Pro Tips and your care team can walk you through. Today is just noticing.
Some meals show up hours later. That's the meal, not me.
If you eat anything high in fat or protein today — cheese, meat, pizza, ice cream, eggs, peanut butter — notice your CGM not just in the first 2 hours, but in the 3rd, 4th, and 5th. Where does the line go?
Small Sip #1435 — All Carbs Aren't Created Equal
Did anything I ate today show up later than I expected?