Upload
national-dairy-council
View
1.926
Download
0
Embed Size (px)
DESCRIPTION
What might be the health of the U.S. population if we all had enough vitamin D? Dr. Robert P. Heaney, MD, FACP, FACN presented this on September 16, 2009 at the Chicago Dietetic Association. The National Dairy Council's Melissa Dobbins was present at the event and blogged about it on TheDairyReport.com.
Citation preview
WHAT WOULD IT LOOK LIKE
IF EVERYONE HAD SUFFICIENT
VITAMIN D?
Robert P. Heaney, MD, FACP, FASN
Creighton University Osteoporosis Research Center
CU ORC
2
VIT D & CARDIOVASCULAR DISEASE
1739 Framingham
Offspring members
age: 59 yrs
follow-up: 5.4 yrs
120 individuals developed
a CV event
HR calculated against
25(OH)D values > 15 ng/mL
Wang et al. Circulation
2008
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Hazard
R
atio
< 10
ng/mL
< 15
ng/mL
> 15
ng/mL
80 % increase
in risk
53 % increase
in risk
BREAST CANCER RISK
Case-control study
1394 cases
1365 controls
Odds ratio for CA
inversely
associated with vit
D status [25(OH)D]
Abbas et al.,
Carcinogenesis (2008)
29:93–99
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Hazard
R
atio
< 3
0
30–4
5
45–6
0
60–7
5
> 7
5
69 % decrease
in risk
Serum 25(OH)D (nmol/L)
CU ORC
4
VITAMIN D & INFLUENZA*
208 African-American,
postmenopausal women
3 yr DB-RCT
placebo or vit D3
800 IU/d – 2 yrs
2000 IU/d – 3rd
yr
basal 25(OH)D: 18.8 ± 7.5
0
5
10
15
20
25
30
35
Placebo Vitamin D
*Aloia & U-Ng (2007) Epidemiol & Infect
P < 0.002
CU ORC
5
VITAMIN D & THE COMMON COLD*
18,883 individuals
in NHANES-III
tested association
between serum
25(OH)D & recent
URTI
0
5
10
15
20
25
% w
ith
U
RT
I
< 10 10–29.9 30+
Serum 25(OH)D (ng/mL)
P < 0.001
association stronger
for those with
asthma & COPD
Ginde et al., Arch Int Med 2009 169:
29 % reduction
CU ORC
6
DIABETES & 25(OH)D
Scragg et al., 2004
Diabetes Care
27:2813–18
NHANES-III
6,228 adults
plasma glucose
independently
predicted by BMI
& serum 25OHD
(fasting and 2 hr
post load)0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Relative R
isk
1st 2nd 3rd 4th
25(OH)D Quartiles
White
Hispanic
NEONATAL VIT D & DIABETES*
10,366 northern
Finnish children
2000 IU Vit D/d 1st
year of life
prevalence of
type I diabetes
assessed at age 31
RR calculated vs. no
supplementation
Vitamin D Administration
Regular
Irregular
? rick
ets
Rel
ativ
e R
isk
0.01
0.1
1
10
Zero
*Hypponen et al., Lancet 2001;358:1500–03
88% lower risk
3-fold higher risk
Similar clinical study results are being published weekly
Two questions: –
How can a single nutrient have such diverse effects in so many different tissues ?
If these effects are correct, why haven’t they been apparent previously ?
Two questions: –
How can a single nutrient have such diverse effects in so many different tissues ?
If these effects are correct, why haven’t they been apparent previously ?
THE VITAMIN D ICEBERG
cell cycle regulation
gene control
Ca economy
THE VITAMIN D ICEBERG
autocrine
endocrine
CU ORC
13
25(OH)D3D
31,25(OH)
2D
3
skin liver kidney gut
CaBP
VIT D – CANONICAL SCHEME
CU ORC
14
25(OH)D3D
3
1,25(OH)2D
3
skin liver
periphery
gut
CaBP
VIT D – EXPANDED SCHEME
kidney
1,25(OH)2D
3
varioustissues
cell
signals
endocrine
autocrine
Autocrine functions
CU ORC
16
AUTOCRINE ACTION
25(OH)D
VDR
1,25D
VDR
1,25D
RXR
VDRE
Transcription
CU ORC
17
AUTOCRINE ACTION
25(OH)D
VDRE
Transcription
cell proliferation
cell differentiation
apoptosis
immune response
24-hydroxylase
CU ORC
18
AUTOCRINE ACTION
25(OH)D
VDRE
Transcription
~ 800 genes
have VDREs
CU ORC
19
AUTOCRINE ACTION
25(OH)D
VDR
1,25D
VDR
1,25D
RXR
VDRE
Transcription
1,25D
25OHD 25OHD
CU ORC
20
AUTOCRINE ACTION
25(OH)D
VDR
VDR
1,25D
RXR
VDRE
Transcription
1,25D
25OHD 25OHD
1,25D
This scheme means that each tissue
has the amount of 1,25(OH)2D it needs
when it needs it
and is not dependent upon a “one-size-fits all” systemic level of circulating1,25(OH)2D
CU ORC
22
VITAMIN D & INNATE IMMUNITY*
activated Toll-like receptor
*Liu et al., Science 2006
CU ORC
23
VITAMIN D & INNATE IMMUNITY*
25(OH)D
bactericidal peptide
Cathelicidin
*Liu et al., Science 2006
CU ORC
24
VITAMIN D & INNATE IMMUNITY*
25(OH)D
human
monocytes
in fetal calf
serum
Cyp27B1VDR
*Liu et al., Science 2006
the Vit D1-a hydroxylase
the Vit D receptor
CU ORC
25
VITAMIN D & INNATE IMMUNITY*
25(OH)D
human
monocytes
in fetal calf
serum
Cyp27B1VDR
*Liu et al., Science 2006
…………
fetal calf
serum is low
in both
25(OH)D &
1,25(OH)2D
CU ORC
26
VITAMIN D & INNATE IMMUNITY*
25(OH)D
human
monocytes
in fetal calf
serum
add
1,25(OH)2D
to the
system
Cyp27B1VDR1,25D
*Liu et al., Science 2006
CathelicidinCyp24
CU ORC
27
VITAMIN D & INNATE IMMUNITY*
25(OH)D
human
monocytes
in fetal calf
serum
add
25(OH) D to
the system Cyp27B1VDR1,25D
*Liu et al., Science 2006
CathelicidinCyp24
25OHD
CU ORC
28
human monocytes
activated with M.
Tuberculosis and
incubated in human
serum
African-American
White
African-American
with added
25(OH)D
VITAMIN D & TUBERCULOSIS
0
1
2
3
4
A- A W A- A
+ 25D
Cathelicidin mRNA
*Liu et al., Science 2006
serum 25(OH)D: 22 nmol/L
serum 25(OH)D: 78 nmol/L
CU ORC
29
VITAMIN D & TUBERCULOSIS
vit D is an essential mediator in the innate
immune response
serum 25(OH)D is the critical variable
at least some of the increased sensitivity to
infection in vit D-deficiency is due to reduction
in response to infectious agents because
25(OH)D is rate-limiting
the greater tuberculosis susceptibility of blacks
is due in part to their low vit D status
these experiments show that:
If this new understanding is correct,
do we see evidence of impaired function in patients with low vitamin D status?
CU ORC
31
VITAMIN D & TUBERCULOSIS*
67 pts with pulmonary
TB
standard treatment
for all
in addition,
randomized to either
vit D 10,000 IU/d or
placebo
50
60
70
80
90
100
Placebo Vit D
Sputum Conversion (%)
*Nursyam et al., Acta Med Indones 2006
P = 0.002
CU ORCCU ORC
CELL MODELS
old: DNA in somatic cells functions mainly to make faithful copies for tissue repair or replacement
DNA functions constantly in synthesis of needed cellular apparatus
new:
CU ORC
33
Signal/
Demand
HOW A CELL RESPONDS
newly synthesized cellular equipment
I don’t have
the equipment
I need . . . .
Response
. . . but I do have
the plans for what
I need in my DNA
library. . . .
CU ORC
34
HOW A CELL RESPONDS
25(OH)D
newly synthesized cellular equipmentResponse
Signal/
Demand
1,25(OH)2D is the key
that unlocks the DNA library
CU ORC
35
PERSPECTIVE
vitamin D is an integral component of the
mechanism whereby cells control gene
transcription in response to a variety of
extracellular stimuli
adequate vitamin D status enables optimal
response to a broad variety of signals
deficiency will manifest itself differently,
depending upon the tissue being stressed,
thus explaining the diversity of responses
Two questions: –
How can a single nutrient have such diverse effects in so many different tissues ?
If these effects are real, why haven’t they been apparent previously ?
CU ORC
37
VITAMIN D & INFLUENZA*
208 African-American,
postmenopausal women
3 yr DB-RCT
placebo or vit D3
800 IU/d – 2 yrs
2000 IU/d – 3rd
yr
basal 25(OH)D: 18.8 ± 7.5
0
5
10
15
20
25
30
35
Placebo Vitamin D
*Aloia & U-Ng (2007) Epidemiol & Infect
P < 0.002
Such differences would not be apparent in ordinary medical practice because people who don’t get sick do not see the doctor –are not tracked and would not be recognized as having been protected.
The protection is seen only when a cohort of well individuals is followed prospectively.
Endocrine mechanism
CU ORC
42
SERUM 25(OH)D (nmol/L)
0 20 40 60 80 100 120 140 160
ABSO
RPT
IO
N FR
AC
TIO
N
0.0
0.1
0.2
0.3
0.4
0.5
A VITAMIN D THRESHOLD
CU ORC
43
SERUM 25(OH)D (nmol/L)
0 20 40 60 80 100 120 140 160
ABSO
RPT
IO
N FR
AC
TIO
N
0.0
0.1
0.2
0.3
0.4
0.5
A VITAMIN D THRESHOLD
physiological regulation no longer limited by vit D availability
CU ORC
44
SERUM 25(OH)D (nmol/L)
0 20 40 60 80 100 120 140 160
ABSO
RPT
IO
N FR
AC
TIO
N
0.0
0.1
0.2
0.3
0.4
0.5
A VITAMIN D THRESHOLD
VITAMIN D – Sources
?Body D
3
stores25(OH)D
VITAMIN D – Sources
?Body D
3
stores25(OH)D
VITAMIN D – Sources
150
Body D3
stores25(OH)D
VITAMIN D – Sources
150
Body D3
stores25(OH)D
typical input, all sources: ~2350 iu
VITAMIN D – Sources
150
Body D3
stores25(OH)D
needed input, all sources: ~4000 iu
CU ORC
50
25(OH)D3D
3
1,25(OH)2D
3
skin liver
periphery
gut
CaBP
VIT D – EXPANDED SCHEME
kidney
1,25(OH)2D
3
varioustissues
cell
signals
endocrine
autocrine
25(OH)D3D
3
1,25(OH)2D
3
skin liver
periphery
gut
CaBP
VIT D – EXPANDED SCHEME
kidney
1,25(OH)2D
3
varioustissues
cell
signals
endocrine
autocrine
Won’t calcitriol meet the body’s need for vitamin D?
NO!
CU ORC
53
25(OH)D3D
31,25(OH)
2D
3
skin liver kidney gut
CaBP
VIT D – CANONICAL SCHEME
Why not just give 1,25(OH)2D?
It’s the active agent, isn’t it?
Answer: you can’t give enough
to achieve needed levels.
This is the value that
needs to be optimized
Bone strength
Serum 25(OH)D and Hip BMD
NHANES-III
Adults Age
20 – 49 yrs
LOWESS plot
of difference
from lowest
quantile
Bischoff-Ferrari HA. Am J Med 2004; 116: 634-9.
Non-Hispanic whites
African-Americans
Hispanics
CU ORC
56
VITAMIN D & FRACTURE RISK
0 25 50 75 100 125 150
(nmol/L)
FR
AC
TU
RE R
ELA
TIV
E R
ISK
(h
ip
, fo
rearm
, sp
in
e)
0.0
0.2
0.4
0.6
0.8
1.0
N = 2,686
ages 65–85
5 yr RCT
Vit D 800
IU/d
Trivedi et al.
BMJ 2003;
326:469
–33%
CU ORC
VITAMIN D & FRACTURES
meta-analysis
9 RCTs
Vit D doses
> 400 IU (but
none > 800 IU)
n = ~ 32,000
Bischoff-Ferrari et al.
Arch Int Med
(2009);169:551
0.0
0.2
0.4
0.6
0.8
1.0
Non-vertebral Hip
Relative Risk
57
CU ORC
58
VITAMIN D & RISK OF FALLING*
122 women
Age: 63–99
DB-RCT
Ca 1,200 mg/d
Ca + 800 IU Vit D
12 week duration
25(OH)D 12 ng/mL
at baseline0.0
0.2
0.4
0.6
0.8
1.0
Fall R
isk
Ca only Ca + D
*Bischoff et al. JBMR. 2003;18:343–351.
–49%
VIT D & NEUROMUSCULAR FUNCTION*
1359 men & women;
mean age 75.5
Amsterdam longitud.
aging study
neuromuscular
performance
measured on a scale
of 0 to 12 (higher is
better)
0
1
2
3
4
5
6
7
8
9
<25 25–50 50–75 >75
SERUM 25(OH)D
Performance Score
each step statistically
significant
*Wicherts et al. JBMR. 2005.
In brief, raising serum 25(OH)D from 50 to ~80 nmol/L
improves Ca absorption, raises BMD, and reduces falls and osteoporotic fracture risk
CU ORC
61
OTHER CHRONIC DISEASES?
osteoporosis
osteoarthritis
falls/neuromusc. fcn
multiple sclerosis
fibromyalgia-like syndrome
type I diabetes
insulin sensitivity
cardiovascular disease
periodontal disease
various cancers
tuberculosis
hypertension
++++
+
++++
++
++
++
++
+++
++++
++++
++++
++++
Disease Status of Evidence
Cardiovascular effects
VIT D & BLOOD PRESSURE*
148 women, aged
74 ± 1
DB–RCT
baseline 25(OH)D <
50 nmol/L
treated for 8 wks
with:
Ca 1200 mg/d or
Ca + 800 IU vit D/d
*Pfeifer et al., JCEM 2001; 86:1633–37INTERVENTION
Ca only Ca+D
Systo
lic B
P (
mm
Hg)
0
125
150
P < 0.01
P < 0.01
P < 0.02
–5.7 –13.1
VIT D & BLOOD PRESSURE*
1811 men & women
with measured
25(OH)D levels**
4 yrs’ observation
97 cases of incident
hypertension
RR computed for
25(OH)D <15ng/mL
vs. >30 ng/mL
*Forman at al., 2007;Hypertension 49:1063
** Health Profs Follow-up Study & Nurses Health Study
>30 <15
Rela
tive R
isk
0.1
1
10
3.18
Anti-promotion for cancer
VITAMIN D & PROSTATE CA*
13 yr
longitudinal
study
19,000 men
149 cases
prostate CA
*Ahonen et al., CancerCauses&Control 11:847-852 (2000) 25(OH)D QUARTILES
1 2 3 4
RELA
TIV
E R
ISK
0.0
0.5
1.0
1.5
2.0
2.5
VITAMIN D & PROSTATE CA*
those below
the median
25(OH)D level
were 70%
more likely to
develop
prostate CA
than those
above
*Ahonen et al., CancerCauses&Control 11:847-852 (2000) 25(OH)D QUARTILES
1 2 3 4
RELA
TIV
E R
ISK
0.0
0.5
1.0
1.5
2.0
2.5
COLORECTAL CANCER
Nurses’ Health Study
ages 46–78
nested case-control
study
193 incident cases
25(OH)D measured
twice, prior to
diagnosis
Feskanich et al., Cancer
Epidemiol Biomarkers Prev
2004 13:1502–080.0
0.2
0.4
0.6
0.8
1.0
Od
ds R
atio
1st–16
2nd–22
3rd–27
4th–31
5th–40
25(OH)D Quintiles (with medians*)
*ng/mL
CU ORC
69
COLORECTAL CANCER
5 prospective
studies
> 200,000
individuals
430 cases
ORs computed
for 25(OH)D
quantiles
Garland et al,
2005
Serum 25(OH)D (nmol/L)
0 20 40 60 80 100 120
Od
ds R
atio
0.0
0.2
0.4
0.6
0.8
1.0
P < 0.001
CU ORC
70
MAMMOGRAPHIC DENSITIES
543 women aged 40–60
1989–90
dietary intakes assessed
with FFQ
odds ratios developed
for <30% vs. >70% of
film with densities
[Berube et al., 2004; Cancer
Epidemiol Biomarkers Prev
13:1466–72]
0.0
0.2
0.4
0.6
0.8
1.0
Od
ds R
atio
1st 2nd 3rd 4th
Quartiles
Vit D
Ca
CU ORC
71
VITAMIN D & CANCER*
1179 healthy women
aged 66.7 ± 7.3
four year trial
1032 finished (87.5%)
baseline 25(OH)D: 71.8 nmol/L ± 20.3
three treatment groups:
control
Ca (1400–1500 mg/d)
Ca plus D3
(1100 IU/d)
achieved 25(OH)D: 96 nmol/L ± 21.4
*Lappe et al. AJCN 2007
VITAMIN D & CANCER*
Time (yrs)
0 1 2 3 4
Fra
cti
on C
ancer-
Fre
e
0.90
0.92
0.94
0.96
0.98
1.00
Ca+D
Placebo
Ca-only
P < 0.01RR = 0.402
*Lappe et al. AJCN 2007
VITAMIN D & CANCER*
Time (yrs)
0 1 2 3 4 5
Fra
cti
on C
ancer-
Fre
e
0.90
0.92
0.94
0.96
0.98
1.00
Ca+D
Placebo
Ca-onlyRR = 0.232
*Lappe et al. AJCN 2007
VITAMIN D & CANCER*
Time (yrs)
0 1 2 3 4 5
Fra
cti
on C
ancer-
Fre
e
0.90
0.92
0.94
0.96
0.98
1.00
Ca+D
Placebo
Ca-only
*Lappe et al. AJCN 2007
96 nmol/L
71.8 nmol/L
CANCERS BY TREATMENT (YRS 2–4)
SitePlacebo
(n=266)
Ca+D
(n = 403)
Breast 7 (2.6%) 4 (1.0%)
Colon 2 (0.7%) 0 (0.0%)
Lung 3 (1.1%) 1 (0.2%)
Marrow/Lymphoma 4 (1.5%) 2(0.5%)
Other 2 (0.7%) 1 (0.2%)
Total 18 (6.8%) 8 (2.0%)*
* P < 0.05
Safety
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
1,000 10,000 100,000 1,000,000 10,000,000
Vitamin D Intake (IU/day)
Seru
m 25(O
H)D
(n
mol/L)
15 studies of adultsreceiving vitamin Dsupplementation(means)
8 studies reportingtoxicity (individualvalues)
VITAMIN D INTAKE & TOXICITY*
* Hathcock JN et al. Am J Clin Nutr. 2007;85:6–18.
no toxicity below 500 nmol/L (200 ng/mL)
no toxicity below 30,000 IU/d
TUIL: 10,000 IU/d*
*Hathcock et al.,(2007) AJCN 85:6–18
CU ORC
79
TWO KEY QUESTIONS
assuming a target value of 80 nmol/L:
how much of an increase in daily inputs
would be required to ensure that no
more than 2.5% of the population fell
below the target value?
what , if anything, is the risk of raising
their 25(OH)D in those who already are
at or above the target value?
CU ORC
80
25(OH)D IN OLDER WOMEN*
1168 women
aged 55 &
older
latitude 41º N
25(OH)D
values
adjusted for
season
median vit D
supplement
dose = 200 IU
25(OH)D (nmol/L)
0 40 80 120 160
Freq
uen
cy
0
20
40
60
80
100
*Lappe et al., JACN 2006
CU ORC
81
SHIFTING THE DISTRIBUTION
improving
vitamin D
status at a
population
level means
raising
everybody’s
value, i.e.,
moving the
distribution
to the right
25(OH)D (nmol/L)
0 20 40 60 80 100 120 140 160 180
RELA
TIV
E FR
EQ
UEN
CY
0.000
0.005
0.010
0.015
0.020
0.025
CU ORC
82
SHIFTING THE DISTRIBUTION
using an effect
size of
1 nmol/L/mg/d
it would require
~2000 IU of
additional D each
day to shift the
distribution
sufficiently to
ensure that no
more than 2.5 %
fell below 80
nmol/L
25(OH)D (nmol/L)
0 50 100 150 200
RELA
TIV
E FR
EQ
UEN
CY
0.000
0.005
0.010
0.015
0.020
0.025
CU ORC
83
SHIFTING THE DISTRIBUTION
taking an effect
size of
1 nmol/L/mg/d
it would require
~2000 IU of
additional D each
day to shift the
distribution
sufficiently to
ensure that no
more than 2.5 %
fell below 80
nmol/L
25(OH)D (nmol/L)
0 50 100 150 200
RELA
TIV
E FR
EQ
UEN
CY
0.000
0.005
0.010
0.015
0.020
0.025
CU ORC
84
SHIFTING THE DISTRIBUTION
what about those
already 2 SD above
the mean?
25(OH)D (nmol/L)
0 50 100 150 200
RELA
TIV
E FR
EQ
UEN
CY
0.000
0.005
0.010
0.015
0.020
0.025
the rise with an
extra ~2000 IU/d
would be
predicted to bring
them to no more
than 170–180
nmol/L – well
below the toxic
range
CU ORC
86
CONCLUSIONS
vitamin D acts in multiple systems
serum 25(OH)D levels below 80 nmol/L
are not adequate for any body system
levels of as high as 120 nmol/L may be
closer to optimal
inputs from all sources combined
(needed to sustain 80 nmol/L) are in
the range of ~4,000 IU/d and higher
CU ORC
87
WHAT IS THE OPERATIVE MODEL?
for the media?
for regulators?
for nutritional policy makers?
for nutritional physiologists?
CU ORC
88
WHAT IS THE OPERATIVE MODEL?
for the media and for regulators
nutrition is about killing yourself
with a fork
it’s about avoiding risks
it’s about warnings & cautions
For a package of
macaroni & cheese
http://vm.cfsan.fda.gov/~dms/foodlab.html
Limit these
nutrients
Get enough of
these
nutrients
CU ORC
91
MEDIA REPORTING
the overwhelming majority of media
reports about nutrition emphasizes harm
and risk
while the explanation is partly that harm
is more newsworthy than benefit (and the
media battens on controversy)
still the impression unwittingly conveyed
to the general public is one of concern
and danger
CU ORC
92
WHAT IS THE OPERATIVE MODEL?
for nutritional policy makers
nutrition is about determining
the least one can get by on
without suffering overt disease
(once called MDRs)
CU ORC
93
WHAT IS THE OPERATIVE MODEL?
for nutritional physiologists
adult nutrition is about preventive
maintenance of tissues and organs
it’s about keeping them from wearing
out or breaking down prematurely
its referent is the intake that prevailed
when human physiology evolved
CU ORC
94
THE PREVENTIVE MAINTENANCE MODEL
foundational premises:
all tissues need all nutrients
shortages impair the functioning of all
body systems
premature organ/system “wearing out”, as
a consequence of nutrient deficiency, will
vary from person to person, depending on
variable genetic composition; and
therefore, expression of nutrient deficiency
will usually be pluriform – both between
and within individuals
CU ORC
95
THE PREVENTIVE MAINTENANCE MODEL
also recognizes that:
the organism will work perfectly well
without maintenance – for a while . . .
it thus reconciles the seeming paradox that
an organism can be “deficient” without
being clinically “sick”
– for a while . . .
it’s also about squaring the morbidity/
mortality curve
CU ORC
96
THEORETICAL MORTALITY CURVE
AGE (yrs)
0 20 40 60 80 100
CU ORC
97
THEORETICAL MORTALITY CURVE
AGE (yrs)
0 10 20 30 40 50 60 70 80 90 100
SU
RV
IVA
L (
%)
0
20
40
60
80
100
CU ORC
98
Age (yrs)
0 10 20 30 40 50 60 70 80 90 100
Perc
ent
alive/w
ell
0
20
40
60
80
100
SQUARING THE MORTALITY CURVE
Certainly, NCEP and DGA take this for granted
Optimal nutrition has the potential to contribute to
this improvement
CU ORC
99
WHAT WOULD IT BE LIKE?
fewer cancers
less diabetes
fewer osteoporotic fractures
less hypertension & CV disease
less periodontal disease
less multiple sclerosis
less severe infectious disease
We don’t really know the true burden of chronic disease.
And we won’t, until everyone has enough vitamin D.
Thank you . . .