Vitamin D explained.

A, B, C… Vitamin D! Here we are highlighting the most important facts about Vitamin D in your body, and why it is so important to get your 10 min daily dose of sun exposure (sunscreen advised of course)!

Who is at risk?

  • People who do not get enough time in the sun
  • People who avoid dairy products
  • People who have a plant-based or vegan diet
  • People with inflammatory bowel disease and other conditions causing fat malabsorption
  • Breast feed infants: humans do not produce enough vitamin D in their milk for dietary needs. 
  • People with dark skin: More melanin pigment in the epidermal layer result reduces the skin’s ability to produce vitamin D from sunlight. 
  • People who are obese or who have undergone gastric bypass surgery: greater amounts of subcutaneous fat sequester more of the vitamin and alter its release into the circulation. Obese individuals who have undergone gastric bypass surgery may become vitamin D deficient over time without a sufficient intake of this nutrient from food or supplements, since part of the upper small intestine where vitamin D is absorbed is bypassed and vitamin D mobilized into the serum from fat stores may not compensate over time 
  •  People with inflammatory bowel disease and other conditions causing fat malabsorption: Vitamin D is a fat-soluble vitamin, so its absorption depends on the gut’s ability to absorb dietary fat. People with a reduced ability to absorb dietary fat due to liver disease, cystic fibrosis, celiac disease, and Crohn’s disease, steroid use, as well as ulcerative colitis might require vitamin D supplementation. 

What does it do?

When sunlight or UV rays hit our skin Pre-Vitamin D is converted into Vitamin D, the usable and active form of the vitamin that helps facilitate Calcium absorption. Vitamin D can also be obtained from food, and supplements are biologically inert and must undergo two hydroxylations in the body for activation. Vitamin D promotes calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations to enable normal mineralization of bone and to prevent hypocalcemic tetany. Vitamin D is also needed for bone growth and bone remodeling by osteoblasts and osteoclasts.

What happens if you don’t get enough?

  • Vitamin D deficiency is associated with rickets, a disease where bone tissue doesn’t mineralize, leading to bone softening and skeletal deformities. 
  • Vitamin D also helps protect older adults from osteoporosis.
  • Vitamin D can prevent irregular cell growth, neuromuscular and immune function
  • Vitamin D also plays a role in reducing inflammation.

Common symptoms: 

  • Increased risk of death from heart disease
  • Cognitive impairment in older adults
  • Muscle weakness
  • Severe asthma
  • Increased Cancer risk

What can happen if you have too much?

  • Vitamin D toxicity signs:
    • anorexia
    • weight loss
    • polyuria
    • heart arrhythmias
    • Increased blood levels of calcium, this can lead to vascular and tissue calcification, and eventually heart, blood vessel, and kidney damage. 

Where is it found? 

 

How much should I have in a day?

 

 

 

More about Vitamin D!

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