Here's a study that found the same effect in people with type 1 diabetes:
Dietary Fat Acutely Increases Glucose Concentrations and Insulin Requirements in Patients With Type 1 Diabetes, Diabetes Care, April 2013
Joslin did a great video:
It was a crossover design, so each person had a chance to eat the high-fat meal and the low-fat meal. When they ate the high-fat meal they needed more insulin to cover the same amount of carbohydrate. The meals had identical carbohydrate and protein, but different fat content (60 grams vs. 10 grams).
"Pizza is widely recognized to cause marked late postprandial hyperglycemia."
"Each subject consumed the same amount of carbohydrates for the LF dinner and HF dinner (96 ± 8 g), and for the two identical breakfast meals (106 ± 14 g)."
That's a lot even for non-diabetics! I would love to see the same HF/LF study replicated with a set of low carb (no more than 120g/day, preferably even less) meal plans.
The observation that pizza had a greater effect on their blood sugar is not particularly surprising to me, and reinforces the idea that pizza is not a good choice for diabetics (or anyone else), except as a very occasional treat.
Type 1s know this. Eat cheese or ice cream = a couple more units of insulin. It's not just the carbs that raise blood sugar but the fat. Good to see they're finally changing the algorithms.
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