Drinking water 15-30 minutes before eating has extremely important physiological meaning concerning the digestion of fats. Digestion of fats (lipids) begins in the duodenum where bile and pancreatic juices are poured. Bile is amphiphilic compound i.e. simultaneously attracts and repels water. Under the influence of peristalsis bile acids mix well with fatty droplets from food emulsifying them. This means that the hydrophilic parts of the molecules of bile salts sink below the surface of the oil drop while the polar (hydrophobic) parts remain on top. Thus are eliminated the barriers to further fragmentation of fat cells because they no longer stick together and repel each other interacting with the aqueous phase. Without sufficient amount of water before meals it is impossible to achieve adequate digestion of fats.
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