TB: Science and Cooking (Brenner, Sorensen, Weitz)
Core Thesis
Food is primarily texture molecules (fats, carbohydrates, proteins) plus water. Cooking is the controlled manipulation of water and heat to break apart texture molecules and transform them into flavor molecules. The same physical principles governing soft-matter physics — polymer networks, packing, surfactants, phase transitions — govern what happens when you heat an egg, bake bread, or whip cream.
Key Takeaways
Texture and water
- Texture molecules (fats, carbohydrates, proteins) plus water make up the weight of food.
- Changing the texture of foods is mainly manipulating the water.
- No liquid we eat has a viscosity lower than water — water is the baseline.
Heat and transformation
- Cooking breaks apart texture molecules and turns them into flavor molecules.
- Heat causes the ingredients of food to fall apart.
- The transition when cooking an egg is mainly protein unfolding — the same applies to steak and other high-protein foods.
Key molecular structures
- Fats: three long carbon chains (C-H bonds) connected at one end. Saturated fats have chains lined up; unsaturated fats have jumbled chains.
- Starches: long chains of sugar molecules attached to each other.
- Proteins and carbohydrates can have electric charge; adding charged substances (or salt, which changes net protein charge) alters folding and taste — almost like applying heat.
Phase transitions and structure
- A material becomes solid once volume fraction is high enough to jam — regardless of material, this occurs around 60–70% volume fraction.
- Plasticity: polymers in a plastic material can slowly slide past each other and form new bonds — governed by the same packing and polymer network principles as other solids.
- Foams: mix a liquid and a gas and you have a solid. Fermented foods are foods cooked with life.
Surfactants
- Naturally occurring surfactants exist because many biological molecules have reasons to be both hydrophobic and hydrophilic (e.g., protein folding, cell walls).
Mental Models
- No reading examples yet — will populate as books are ingested.