Short answers, pulled from the story.
Archaeological evidence points to the Old Kingdom of Ancient Egypt around 2500 BC as the earliest known instance of frying. This method appeared in kitchens where oil or fat served as a cooking medium for various foods.
During frying, protein denaturation occurs alongside starch gelatinization and rapid water evaporation from the food surface. These chemical changes create characteristic crispness while allowing oils to penetrate the food to varying degrees.
Shallow frying uses enough fat to cover only one-third to one-half of each piece being cooked. Deep-frying fully immerses food in hot oil that is typically reused multiple times before disposal.
Deep-frying forms the foundation of a massive worldwide industry producing items like potato chips and instant noodles. The process allows foods to emerge sterile with relatively long shelf lives suitable for global distribution networks.
A 2021 meta-analysis linked highest fried food consumption categories to a three percent increase in all-cause mortality risks. Those eating most fried foods faced thirty-seven percent higher heart failure risks compared to low-intake participants.