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FNH 351 - Coggle Diagram

- - - - fatty fish, meats, milk (fortified), mushrooms (low amount but richest of plant options)
      - Animal - Vitamin D3 / cholecalciferol
        Plants - Vitamin D2 / ergocalciferol
        Supplements - D2 and D3
      - Endogenous synthesis --> where most D comes from, dependent on skin exposure/colour & available sunlight
    - - DRI
        
        600 IU (15 ug)
    - - D2: Ergocalciferol - synthesized in plants D3: Cholecalciferol - synthesized in animals Active form: 1.25-(OH)2-D - calcitriol
    - - Digestion
        
        none required
      - Absorption
        
        Where: mostly jejunum
        
        Overall rate: 50%
        
        How:
        Absorbed into micelles (passive diffusion)
        Incorporated into chylomicrons into enterocyte
        Chylomicrons --> lymph --> blood --> vitamin D to extrahepatic tissue
        Chylomicron remnants --> remaining vitamin D to liver