Vitamin D: Who is really at risk of deficiency?
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1 Beyond the Break March 2018 Vitamin D: Who is really at risk of deficiency? Stephanie A Atkinson, PhD, DSc (Hon),FCAHS Professor, Department of Pediatrics, McMaster University McMaster Children s Hospital
2 Information Overload on Vitamin D D-lemmas of D!
3 Five Vitamin D-lemmas Why do we need it? How much do we need? How to measure vitamin D status? Who is at risk of deficiency? o General Canadian population o Clinical disorders How do we optimize D status?
4 UVB RadiaDon 7-dehydrocholesterol in skin Vitamin D Dietary Sources +D Sunshine Foods containing D3 Synthesis, Metabolism & FuncHons of Vitamin D Liver 25(OH)D Major CirculaDng Metabolite Kidneys Pancreas Placenta Lungs, Colon, Macrophage Skin, Prostate, Breast 1,25(OH) 2 D AcDve Metabolite Impacts calcium homeostasis Aids blood pressure reguladon Promotes bone formadon Improves cardiovascular health Aids neurodevelopment Facilitates insulin secredon Influences fetal programming aand placental development Supports placental calcium atransfer for fetal bone mineral aaccrual Regulates cell cycle Inhibits cell proliferadon Apoptosis reguladon Angiogenesis inhibidon ImmunomodulaDon Enhances innate immunity Regulates auto-immune response Biological Effects Lockau & Atkinson 2017
5 #2 Vitamin D-lemma How much do we need? o Dietary Reference Intakes (DRIs) o Other recommendations why do they exist?
6 DRI for Vitamin D EAR Infants to 1 yr AI=400 (10) RDA, IU(µg)/day 1-70 yr (15) >70 yr *(20) Pregnancy/ (15) lactation 2011 * Higher due to greater variability in needs in older persons
7 How much is too much Vitamin D? Upper Level - IU/d (µg) Infants: (25-38 µg) 1-3 yr: 2500 (63 µg) 4-8 yr: 3000 (75 µg) 9 yr+ : 4000 (100 µg) Basis Ø Hypercalcemia of hypervitaminosis D
8 Dilemma.. Why do different vitamin D recommendations exist from other agencies???
9 Variations in Vitamin D Recommended Intakes (IU/d) Age Group yr DRI RDA 2011 Osteoporosis Canada, 2010 US Endocrine Soc (2000 > 50 y) > Pregnancy Lactation UL > 9 y 4000 Lact y 4000 >19 y 10,000
10 Rationale for Vitamin D Guidelines* DRIs for general healthy populations not therapeutic guidelines systematic review Osteoporosis Canada target is adults at risk of osteoporosis systematic review US Endocrine Society not based on systematic review different targets for vitamin D status and deficiency criteria and populations at risk (Rosen LJ &IOM DRI committee. JCEM 2012 ) * Citations for Guidelines on last slide
11 #3 Vitamin D-lemma Is vitamin D status easily measured? o What to assess? o What are normal values? o Who to assess? o Health authority regulations?
12 Measure of Vitamin D Status D3 - D3 Wagner CL et al. Nutrients 2012 (Breas6eed Med 2008) 12
13 Definitions for Vitamin D Status by IOM Severe Deficiency EAR ADEQUATE RDA > 50 nm for bone health Cut-off Values by IOM DRIs (2011)* Serum 25OHD, nmol/l *IOM. DRI for calcium and vitamin D. NAP, Washington. 2011
14 Other Normal Values Vit D Status 25OHD, nmol/l Severely Deficient DRI US/ CAN 2010 US Endocrine Society 2010 Other (clinical labs) <30 <25 < 30 Insufficient >30 <75 Adequate/ Sufficiency >50 >75 > 75/80 Excess >150 for UL >250
15 Clinical Utility of Vitamin D Testing Ontario Health Technology Advisory Committee (OHTAC)* Vitamin D tests in Ontario mostly requested by patients àsoared in 5 yr , , over 730,000 COST $7.1M $66 M rev_vitamin%20d_ pdf
16 Testing of Vitamin D Status OHTAC 2010 Recommendations No routine vitamin D testing in general population o Vitamin D intake/supplementation recommended by Health Canada through education OHIP (and other provinces) pay for testing only for: o osteoporosis, rickets, osteopenia, malabsorption syndromes, and renal disease or drugs that affect vitamin D metabolism. Report at: %20d_ pdf
17 #3 Vitamin D lemma Is status easily measured? à YES Not necessary for most people, unless uncertain of intake May be costly if not clinically indicated
18 #4 Vitamin D-lemma Are Canadians at risk of vitamin D deficiency?
19 Vitamin D Status of Canadians Canadian Health Measures Survey Cross sectional survey: 3 to 79 y N= ~5600 subjects/cycle in sites Cycle 1: Mar 2007 to Feb 2009 Cycle 2: Sept 2009 to Dec 2011 Cycle 3: Jan 2012 to Dec Cycle 4: Jan 2014 to Dec Analysis of data across Cycles 1-3
20 Vitamin D Status in Canadians: % 25% % Vitamin D Deficient or Insufficient 20% 8% 30% 12% 27% 6% 20%
21 Variables in vitamin D status* Diet Servings milk/d Servings fatty fish/d Supplement use Sun exposure UVB rays by season Sunscreen SPF Subject characteristics Age and sex White/non-White Serum cholesterol BMI * Significant in mul@ple regression model. SPJ Brooks et al. JAOAC Intern 2017
22 Nutrient inadequacy (intakes< EAR): Canadian adults (2004) 80-90% of Canadians had vit D intakes <EAR Since deficient status occurs in only 10%; sun exposure must be a major contributor
23 Vitamin D Status by Milk Consumption 23
24 Vitamin D Supplements Alter Status CHMS Cycle In ~21% subjects taking D- supplements : s25ohd changes by season (#3 is summer) smilar to non-sup users; s25ohd higher by 11 nmol/l Note: D-supplement use rose from 2004 to 2015, especially > 31 yr (StatsCan, 6/17) ~ 11 nmol/l SPJ Brooks et al. JAOAC Intern 2017
25 Vitamin D & Population Diversity
26 Vitamin D Status by Skin Colour % Vitamin D Deficient or Insufficient White 6% 21% Other 20% 38% hkp:// 26
27 Multi-ancestry Canadians ~ 21 yr old university students % s25(oh)d < 50 nm 85.2% 34.4% 93.5%, <0.001 P< P< Gozdzik et al. BMC Public Health :336
28 Vitamin D Status at 3-17 years by BMI Overweight/obese: 31% children h$p:// 28
29 Vitamin D Status & BMI - s25ohd with BMI - Varies by racial grouping
30 Summary: Vitamin D Status ( ) Adequate (serum 25OHD > 50 nmol/l) - a level sufficient for healthy bones for most people ~68% of all Canadians; most children 3 to 5 yr Adequacy more prevalent in: o White vs non-white o Vitamin D supplement users o Normal weight vs obese o Summer vs winter o Milk and fish consumers Deficient (< 30 nmol/l) ~ 10% Canadians ~ 20% non-white
31 #5 Vitamin D-lemma Who is risk of sub-optimal D status? o Low sun exposure Skin pigment Full-coverage clothing Live/work/play indoors o Non-milk and non-fish eaters o Non-supplement users NO SURPRISES here!!!!!!!!!!! o Obese due to sequestration of vitamin D in adipose tissue o Breast-fed without D supplements
32 Clinical Risks of Vitamin D Deficiency
33 Vitamin D Deficiency Rickets in Children: A national travesty Canadian Pediatric Surveillance Program (CPSP); n=2400 pediatricians N= 104 cases of rickets Radiographic rickets in 93% cases at mean age of 1.4 y vit D deficiency in 75%: 25OHD=15 nmol/l (6 ng/ml) Demographics: 93% term infants 10% Caucasian; 24% Inuit/First Nations; 33% black 96% breast-fed (mean 14 wk) 86% NO vitamin D supplements
34 2015: Rickets still striking Canadian kids h4p:// one-time survey of 671 pediatricians N= 149 cases reported by 58 MDs 48 radiographic rickets - ~67% 0-2 yr; 23% 3-8 yr 101 severe symptomatic vit D deficiency but no rickets - ~26% 0-2 yr; ~26% 3-8 yr; 48% > 9 yr Symptoms: hypotonia/weakness; delayed milestones; fractures; poor dentition; cardiomyopathy; respiratory distress; seizures Demographics: intermediate/dark skin; exclusive breast feeding; no vit D supplement h4ps://
35 Prevention of Rickets in Kids Pregnancy Ensure dietary sources & vitamin D supplement (600 IU/d) Infants Breast-fed±formula 0-2 y Vitamin D drops 400 IU/d Toddlers and children D-fortified beverage milk, soy, other plant-based Or 600 IU/d +D 400 IU D +D +Ca
36 Clinical Disorders of Vitamin D Deficiency Kidney disease Malabsorption syndromes Severe liver disease Drug interactions: anticonvulsants, cimetidine, thiazides, corticosteroids Drugs that decrease absorption: mineral oil, laxatives orlistat, cholestyramine etc.
37 Clinical Disorders Malabsorption of vitamin D celiac disease cystic fibrosis inflammatory bowel diseases, Crohn s > ulcerative colitis short bowel syndrome autoimmune hepatitis small intestinal bacterial overgrowth lactose intolerance Therapy include high dose vitamin D supplements > RDA and possibly UV tanning beds or moderate sun exposure
38 Approaches to Ensure Optimal Vitamin D Status in Canadians
39 Vitamin D in Fortified Food Fortification IU/100g Mandatory Cow milk (42) Margarine (530) Optional Cereals (350) Grains/pasta (90) Fruit juice (40) Plant milks (42)
40 Health Canada to Increase D-Fortification February 2018 Health Canada recognizes that it is challenging for Canadians to consume the recommended amounts of vitamin D through the current food supply. GOAL To address insufficient vitamin D in the food supply to allow Canadians to meet intake recommendations & reduce current vitamin D inadequacy (20%) & deficiency (8%) hkp://gazeke.gc.ca/rp-pr/p1/2018/ /html/reg2-eng.html
41 Health Canada to Increase D-Fortification New vitamin D fortification strategy Phase 1 - Double vitamin D in cow and goat milk (2 µg/100 ml) & margarine (26 µg/100g) by amendment to Food and Drugs Regulations may take to 2022 to implement Permit vitamin D fortification of yogurt and fortified plant-based beverages equal to milk Phase 2 permit addition of vitamin D to other vehicles based on popularity of consumption in subpopulations at risk of vitamin D deficiency and inadequacy (dark skin & obese). hkp://gazeke.gc.ca/rp-pr/p1/2018/ /html/reg2-eng.html
42 Vitamin D lemmas: Current status Issues: Well documented with CHMS data Resolutions: Target risk groups with education & food sources o Breast-fed infants to 2 yr o Non-white especially very dark skin o Low sun exposure living indoors, clothing coverage o Overweight due to sequestration of vit D in adipose o Non-milk/non-fatty fish eaters Improved vitamin D availability in food supply - FDR Need implementation strategies in community o Health Canada o Public health initiatives o School Boards
43 Options to Increase Intake of Vitamin D D 3 D 2 Fish oil Vegan Organic Gluten-free Capsule Gel cap Drop Liquid Flavoured Chewable
44 D end of D-lemmas!
45 Key References Lockau L, Atkinson SA. Vitamin D s role in health and disease: Does the present inform the past? InternaDonal Journal of Paleopathology h_ps://doi.org/ /j.ijpp InsDtute of Medicine, DRI for Vitamin D and Calcium. h_p:// Osteoporosis Vitamin D Guideline - h_p:// sid=f553e b d1cc9e1 Endocrine Society Vitamin D Guideline h_p:// StaDsDcs Canada, Vitamin D blood levels of Canadians, CHMS 2013 h_p:// Brooks, SPJ et al. An analysis of factors associated with 25-hydroxyvitami n D levels in white and non-white Canadians. J AOAC Intern 2017;100:1345 Health Canada- NutriDon for Healthy Term Infants infant-feeding/nutrition-healthy-term-infants-recommendations-birth-sixmonths.html#a12
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