Fat soluble vitamins

Human Nutrition 3(3+0)
Lesson 32 : Summary of vitamins

Fat soluble vitamins

A summary of fat and water-soluble vitamins, their functions, deficiency symptoms and food sources.



Deficiency symptoms



Vitamin A (retinoid) and pro-vitamin A (carotenoids)

  • Vision in dim light and color vision
  • Promote growth
  • Prevent drying of skin and eyes
  • Promote resistance to bacterial infection

Poor growth, night blindness, dry skin(keratinization), Xerophthalmia

Preformed vitamin A: liver, fortified milk, fish liver oils Provitamin A: red, orange, dark green, and yellow vegetables, orange fruits

Headache, vomiting, double vision, hair loss, dry mucous membranes, bone and joint pain, fractures, liver damage, hemorrhage, coma

Vitamin D (Chole-and ergo-calciferol

  • Facilitates absorption of calcium and phosphorus
  • Maintains optimum calcification of bone

Rickets in children,
Osteomalacia in older adults

Egg Yolk, Milk. Exposure to sun enables body to make its own Vitamin D.

Calcification of soft tissues, growth restriction, excess calcium excretion via the kidney.

Vitamin E (Tocopherols Tocotrienols)

  • Antioxidant
  • Prevent breakdown of vitamin A and unsaturated fatty acids

Hemolysis of red blood cells,
Degeneration of sensory neurons

Vegetable oils, nuts, green leafy vegetables

Inhibition of vitamin K metabolism.

Vitamin K (Phyllo- and menaquinone)

Synthesis of blood clotting factors and bone proteins

Hemorrhage, fractures

Green leafy vegetables, liver, also synthesized by intestinal microorganisms

No upper level has been set

Last modified: Monday, 13 February 2012, 6:36 AM