Nutrition Lecture Three

1
Digestion of Fat
2
Fat Absorption
3
Transport of Lipids in Blood

• Lipids are insoluble in water and blood fluids
• must be carried with proteins called
  Lipoproteins

4
Lipoproteins

• Chylomicra carry fat from Intestine to tissue
• LDL ( low density lipoprotein)
• carry lipids from Liver to tissues
• chylomicra return to liver
• HDL carry cholesterol from tissues to liver
• known as Revers transport

5
Lipoproteins
Liver
Chylomicra
VLDLP
Intestine
HDLP
LDLP
IDLP
Body tissues
6
Danger of Excess Dietary Fat -

• Cancer
• Undigested fatty acids reaching the colon
  stimulates cancer
• fatty acids make soap that wash of cells off the
  lining the gut
• This acts as a MITOGEN ie stimulates cell
  growth
• Cancer needs two stages to start

• Mutagen and then mitagen

7
Danger of Excess Dietary Fat
Cardiovascular Disease

• Increases cholesterol production
• inballance of carbohydrate and fat metabolism
• cardiovascular disease

• Obesity
• Diabetes

8
The End