Digestion size of the meal, and the process of digestion normally takes between 24 and 72 hours. Digestion begins in the mouth with the secretion of saliva and its digestive enzymes. Food is formed into a bolus by the mechanical mastication and swallowed into the esophagus from where it enters the stomach through the action of peristalsis. Gastric juice contains hydrochloric acid and pepsin which would damage the walls of the stomach and mucus is secreted for protection. In the stomach further release of enzymes break down the food further and this is combined with the churning action of the stomach.
Food presentation in food aesthetics is the development of molecular food in Spain, which emphasizes the essence of food using scientific elements. Molecular science can break down the roles of carbohydrates and protein in order to isolate what creates particular tastes. For instance, modern science makes it possible to freeze ice cream using liquid nitrogen and create wine using sugars, creating efficient and visually interesting new dishes. Like other aspects of culture, food presentation is subject to trends and fads. For instance, "unicorn food", a style of presentation that uses a rainbow color palette to decorate food, became popular in 2017. The