NUTR 1010 Lecture Notes - Lecture 3: Myalgia, Hydroxylapatite, Sunscreen

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Conditionally essential: we can make it ourselves if we"re exposed to enough sunlight. If not, we have to get it from foods. Vitamin d may play a role in helping the body fight viruses and infections. Synthesize it from a form of cholesterol in our skin (need uv light from the sun) In edmonton alberta, people synthesize no vitamin d between october and may. Up to 40% of canadian have inadequate blood vitamin d levels during winter and/or spring. Elderly: older skin has fewer vitamin d making compounds. People who work inside during the middle of the day (between 10am and 3 pm) Farmed salmon has about 1/4 of the vitamin d as wild. Most of our dietary vitamin d comes from fortified beverages. Yogurt and cheese are not fortified with vitamin d. 10 months to 70 years needs 600 iu or 15ug. 70 years + needs 800 iu or 20ug.

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