When I was in High School I would cook for myself and my family sometimes. We would buy a large pizza and make it in the oven. Some of it was in the fridge, and I noticed that cold pizza tastes good as well and reduces stress. I had a discussion in school and most students said they prefer pizza hot, yet one of the students disagreed.

I'm not a psychologist, so I asked an AI, that can't create anything new yet can pull up knowledge gathered from many places to this phenomena, that I've decided to quote here.

"When a freshly baked pizza is placed in the refrigerator, the temperature drop triggers a molecular transformation known as starch retrogradation. This process permanently changes how your body breaks down carbohydrates. [1, 2, 3]

The physical cooling process alters the starch structure through a specific sequence of chemical shifts:

1. From Gelatinization to Crystallization

During the high-heat baking process, the starches in the pizza dough absorb water and expand, a stage called gelatinization. When you cool that pizza crust down below 40°F (4°C) in the refrigerator, the starch molecules (specifically amylose and amylopectin) begin to cool, realign, and tightly pack together. They form an ordered, crystalline structure that behaves completely differently in your digestive tract. [1, 2, 3, 4, 5]

2. The Creation of "Resistant Starch"

This newly formed crystalline grid turns regular, rapidly digestible carbohydrates into resistant starch. Because the molecular chains are bound so tightly together, your body’s digestive enzymes (like alpha-amylase) cannot easily latch onto them to break them down. Essentially, the starch resists normal digestion. [1, 2, 3, 4]

3. Behaving Like Dietary Fiber

Because your small intestine cannot break these resistant starches down into simple sugars, they bypass early digestion entirely: [1, 2]

• Lower Blood Sugar Spikes: Fresh, hot pizza crust causes a rapid rise in blood glucose as it quickly turns to sugar. Cold pizza, however, releases glucose much slower, flattening the blood sugar spike. [1, 2, 3, 4]
• Prebiotic Fuel for the Gut: The resistant starch travels intact all the way to your large intestine. Once there, it acts as a prebiotic fiber, feeding the beneficial bacteria in your microbiome. These bacteria ferment the starch into short-chain fatty acids, which support gut health and reduce overall body inflammation. [1, 2]

So you see, cold pizza lowers stress through maintaining a healthy blood sugar and acting as prebiotic fuel for the body. (Which could be useful for diabetics.) :)

I feel I have to write one last thing. I think it's okay for me to share this, and also that many people in the whole world have had a piece of cold pizza from the fridge from time to time.