Digestion 0.5% hydrochloric acid (HCl), which lowers the pH to the desired pH of 1-3. Acid release is also triggered by acetylcholine and histamine. The intestinal phase has two parts, the excitatory and the inhibitory. Partially digested food fills the duodenum. This triggers intestinal gastrin to be released. Enterogastric reflex inhibits vagal nuclei, activating sympathetic fibers causing the pyloric sphincter to tighten to prevent more food from entering, and inhibits local reflexes. Protein digestion occurs in the stomach and duodenum in which 3 main enzymes, pepsin secreted by the stomach and trypsin and chymotrypsin secreted by the pancreas, break down food
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