Man’s Food Module 3

Man’s Food Module 3 - Mans Food Module 3-...

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Man’s Food Module 3- The micronutrients Lesson 10- Vitamins What are Vitamins? Tasteless organic compounds. Non-caloric. Body cannot make them so we get them from our diet Called micronutrients because they perform their functions in very small amounts 13 vitamins needed by the body- either fat soluble (A, D, E, K) or water soluble (B and C) Two types of vitamin deficiencies- Primary (when vitamin is lacking in the diet). Secondary- when you eat a a lot th of foods that contain few vitamins Multivitamins and Megavitamins Multivitamin- many vitamins in one pill Megavitamin- large dose of one nutrient in a pill Multivitamins are measured either in milligrams or micrograms Some are measured according to their IU (international unit)- this helps you assess the nutrient value of vitamin precursors Other vitamin values are expressed as vitamin equivalents Fat Soluble Vitamins- Vitamin A Preformed Vitamin A- Retinoids that your body readily uses (eggs, milk and cheese) Provitamin A carotenoids- From plant sources which can be converted to retinol in the body (carrots, squash, sweet potatoes) Benefits of Vitamin A Helps the eyes, skin, lungs, intestinal tract, kidneys. Creates white blood cells that can help fight disease Consequences of Excessive Vitamin A For an adult male, 900 mg and above is toxic and for females 700 mg and above Symptoms are hair loss, joint pain, rashes, and liver damage Vitamin A Deficiencies Blindness and stunted growth
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Vitamin A and the Visual Cycle Retinal enables our eyes to react to changes in light Light enters through cornea and hits retina- a light sensitive membrane Retinal is composed of light sensitive rods and cones that aid in seeing color As light energy hits retina, pigment molecules called Rhodopsin (made of retinol and a protein called opsin) separate. Changes shape to transfiguration, which conveys info to brain Vitamin D Sunshine vitamin because it is made in your body with the help of the sun’s ultraviolet rays Individuals with darker skin need longer periods of sun exposure to get Vitamin D and sunscreen can block it Can also get it by eating breakfast cereals and yogurt Benefits of Vitamin D Helps stimulate absorption of calcium and phosphorus. Also maintains blood calcium and works with calcium to help your teeth Consequences of Excessive Vitamin D Symptoms include headaches, nausea, and problems caused by calcium spilling into the blood and the soft tissue Vitamin D Deficiencies Rickets- bone growth disease in children Osteomalacia- adult equivalent of rickets Osteoporosis- makes bones become porous and can cause curvature of spine Activation of Vitamin D Ultraviolet rays of sun react with 7 dehydro cholesterol Forms provitamin D 3 which is absorbed through skin and transported to liver and converted to Calcidiol Taken to kidneys and transformed into calcitrol which can now participate in regulation of calcium in metabolism
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Man’s Food Module 3 - Mans Food Module 3-...

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