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Prediabetes
Carol H. Wysham, MD
What is Diabetes?
• Normally, blood sugar (glucose) levels are kept in the normal range by the release of insulin from the islet cells of the pancreas
• Insulin helps glucose enter the cells. • Diabetes occurs when the body doesn’t produce
enough insulin or the body can’t use it properly. This results in sugar (glucose) building up within the bloodstream
• Diagnosed by blood test – Fasting glucose > 125mg/dl – Random blood glucose > 200mg/dl
Pancreas
Cannot Produce Enough Insulin
Body lacks insulin or is unable to use insulin
effectively
Diabetes
Muscle and Fat Cells
Cannot Use Insulin Effectively
How Food is Digested
1. Food enters stomach
5. Insulin unlocks receptors
4. Pancreas releases insulin
2. Food is converted into glucose
3. Glucose enters bloodstream
6. Glucose enters cell
• Type 1 Diabetes is caused by an activation of the immune system that causes destruction of the insulin producing cells (islet cells) in the pancreas.
• Type 2 Diabetes is caused by two conditions:– Insulin resistance: an inherited problem where the
body needs more insulin to process sugar. Insulin resistance worsens with increased weight.
– Insulin deficiency: the islet cells of the pancreas are unable to make enough insulin to overcome the resistance.
What Causes Diabetes
0
4
8
12
1980 1990 2000 (Estimated)•From Centers for Disease Control and Prevention, 2000.
•D
iag
no
se
d C
as
es
(M
illio
ns
)
•+17%
•+60%
Diabetes: 17 Million and Climbing• Estimated 11 million diagnosed + 5.4 million undiagnosed • Type 2 diabetes accounts for 95% of cases• Over 2,200 new cases are diagnosed each day
Residual Lifetime Risk of Diabetes (%)
Baseline Age, y Male Female
0 32.8 38.5
10 32.1 37.9
20 31.9 37.3
30 31.3 35.7
40 29.5 32.6
50 25.5 28.2
60 18.9 22.4
70 11.2 14.6
80 5.2 6.9Narayan KMV et al JAMA 290: 1884, 2003
NHANES: Diabetes Prevalence by Age
0
2
4
6
8
10
12
14
18-29 30-39 40-49 50-59 60-69 >79
1990
1998
Age, in years
%
Source: CDC
$ spent on fast food
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
1990 1992 1994 1996 1998 2000
Diabetes Prevalence of obesity, increased by 61% since 1991
65% of US adults are overweight
BMI and weight gain major risk factors for diabetes
The Prevalence of Diabetes and Obesity
Pre
vale
nc
e
(%)
72
73
74
75
76
77
78Mean body weight
kg
Year
(70)
(110)
The Less You Exercise and the More You Watch TV, the Chances of Getting Diabetes Will Be
Significantly Increased!
Hu et al. Arch Intern Med. 2001;161:1542.
3.0
2.5
2.0
1.5
1.0
0.5
0>15.0
8.1-15.03.6-8.0 3.5
46.0
23.6-45.9
10.0-23.5
<10.0
Quartiles ofMET - hours per weekQuartiles of no. of hours
watching TV per week
RR
Not too long ago we were hunters and gatherers doing physical labor for our daily existence
The Evolution of Man: The Thrifty Gene Hypothesis
Why is Diabetes More Common?
+
=
+
You would not believe the increase in diabetes in Japan and other developed countries around the world
Risk Factors for the Development of Type 2 Diabetes
• Family history of diabetes
• Obesity– Especially central
• Hypertension• High triglycerides• Low HDL-C• Elevated glucose
• Ethnicity other than Caucasian
• Vascular disease• History of gestational
diabetes• History of baby
weighing > 9 lbs• Sedentary lifestyle• Schizophrenia
Patterns of Body Fat Distribution
Abdominal(android)
Lower body(gynoid)
Acanthosis Nigricans
Why Do We Worry About Diabetes?
• Association with debilitating complications– Preventable with aggressive treatment
• High cost of care– Mostly due to costs of caring for
complications
• Diabetes can be prevented
Retinopathy: 25x
Complications of Diabetes
End-Stage Kidney Disease: 17x
Heart Disease: 2-4x
Foot/Leg Amputations:
5x
Stroke: 2-6x
Changein HbA1C
Microvascular Complications
0
-1
-2
-3
-4
-5
United Kingdom Prospective Diabetes Study (UKPDS)
0
- 5
-10
-15
-20
-25
- 0.9%
- 25%
1% Decrease in HbA1c = 25% Decrease in Microvascular Risk!
Ch
ange
in H
bA
1c
% C
han
ge in
Rat
e of
C
omp
lica
t ion
s
Glucose Metabolism
Normal GlucoseMetabolism
Prediabetes Diabetes
0
220
180
160
140
120
100
200P
lasm
a g
luco
se (
mg
/dl)
Diabetes
IGT
Normoglycaemia
1 2 3Time following meal (hrs)
Harris MI. Diabetes Care 1993, 16: 642-652.
Glucose Levels in Normal, Glucose Levels in Normal, Prediabetic and Diabetic SubjectsPrediabetic and Diabetic Subjects
What is Prediabetes?
Prevalence of Prediabetes in US Adults aged 45 - 74
All races 22.6% (11.9 million)
Non-Hispanic Whites 22.2% (8.9)
Non-Hispanic Blacks 18.9% (1.0)
Mexican-Americans 27.3% (0.7)
Why Worry About Prediabetes?
• Predicts high risk for development of diabetes
• Predicts high risk for development of atherosclerotic vascular disease
• Both are largely preventable through lifestyle and pharmacologic interventions
Risk of Cardiovascular Disease Is Elevated Prior to Diagnosis of T2DM
6.00
12.00
18
27
0.00
5.00
10.00
15.00
20.00
25.00
30.00
Normal IGT New DM Previous DM
% w
ith
CV
D
*MI=myocardial infarction.
Adapted from: Hu F, et al. Diabetes Care. 2002;25:1129-1134.
Prevention of Diabetes
The Finnish Diabetes Prevention Study: Lifestyle Modifications (cont’d)
0
20
40
60
80
Control (n=250) Diet intervention (n=256)
Inci
den
ce
of
dia
be
tes
(cas
es
/10
00 p
erso
n-y
ears
)
Tuomilehto et al. N Engl J Med. 2001;344:1343.
58%
The Finnish Diabetes Prevention Study:Lifestyle Modifications
• 522 overweight individuals with IGT randomized to
– Control: diet instruction at the onset of study
– Individualized advice given 7 times in the first year and every 3 months thereafter with goals of
• Weight loss 5%
• Reducing fat intake to <30% of energy consumption
• Increasing fiber intake to 15 g/1000 kcal
• Exercising at a moderate level for 30 min/d
• Primary end point: Prevention of diabetes, as assessed by annual OGTT
Tuomilehto et al. N Engl J Med. 2001;344:1343.
The Finnish Diabetes Prevention Study: Lifestyle Modifications (cont’d)
-6
-5
-4
-3
-2
-1
0
Weight (kg) Waist (cm) SBP (mm Hg) DBP (mm Hg)
Control (n=250) Diet intervention (n=256)
Ch
an
ge
fro
m b
ase
line
Tuomilehto et al. N Engl J Med. 2001;344:1343.
P<0.001 P<0.001P=0.007 P=0.02
FDPS: Incidence of Diabetes By Success Score
0
5
10
15
20
25
30
35
40
0 1 2 3 4 5
Control
Intervention
Success Score
Inci
den
ce o
f D
iab
etes
(%
)
Tuomilehto et al. NEJM2001; 344: 1343
The Diabetes Prevention Program
Sponsored by the NIDDK, NIA, NICHD, NIH, IHS, CDC, ADA, Sponsored by the NIDDK, NIA, NICHD, NIH, IHS, CDC, ADA, and other agencies and corporationsand other agencies and corporations
A Randomized Clinical Trial to Prevent Type 2 Diabetes
in Persons at High Risk
Diabetes Prevention Program: Primary Objectives
• Compare safety and efficacy of 4 interventions for preventing or delaying development of diabetes – Standard lifestyle recommendations + masked
metformin titrated to 850 mg bid or troglitazone 400 mg/d
– Standard lifestyle recommendations + masked placebo
– Intensive lifestyle intervention by case managers with goals of 7% weight reduction through healthy eating and
physical activity 150 min/wk moderate intensity physical activity
The Diabetes Prevention Program Research Group. Diabetes Care. 1999;22:623.
Diabetes Prevention Program:Achievement of Study Goals
Average follow-up of 2.8 years
Goal % Achieving Goal
Lifestyle modifications Week 24 Last visit
Weight loss 7% 50% 38%
Physical activity 150 74% 58%(min/wk)
Pharmacologic intervention Placebo Metformin
Compliance 80% 77% 72%
Full dose 2 tablets/d 97% 84%
The Diabetes Prevention Program Research Group. N Engl J Med. 2002;346:393.
Diabetes Prevention Program:Effects on Weight and Dietary Intake
Lifestyle Placebo Metformin Intervention P Value
Change in weight (kg) -0.1 -2.1 -5.6 <0.001
Change in fat intake*(% of total calories) -0.8 -0.8 -6.6 <0.001
Change in energy intake (kcal/d) at 1 year -249 -296 -450 <0.001
*Baseline fat intake was 34.1% of total calories. The goal of intensive lifestyle modification was <25% of total calories.
The Diabetes Prevention Program Research Group. N Engl J Med. 2002;346:393.
Diabetes Prevention Program:Progression to Type 2 Diabetes
0
2
4
6
8
10
12
Placebo Metformin Intensivelifestyle
Ca
ses
/10
0 p
ers
on
-ye
ars
Average follow-up of 2.8 years
31%*
58%*
*All pairwise comparisons significantly different by group; sequential log-rank test.
The Diabetes Prevention Program Research Group. N Engl J Med. 2002;346:393.
Pancreas
Cannot Produce Enough Insulin
Body lacks insulin or is unable to use insulin
effectively
Diabetes
Muscle and Fat Cells
Cannot Use Insulin Effectively
Prevalence of IR in Selected Metabolic Disorders
Bonora E, et al. Diabetes. 1998;47:1643-1649.Haffner SM, et al. Am J Med. 1997;103:152-162.
IRHypertension: 58%
Hyperuricemia: 63%Hypertriglyceridemia: 84%
T2DM: 92%
Low HDL cholesterol: 88%
Those with multiple disorders (diabetes, hypertension, dyslipidemia, and hyperuricemia):
95%
• 30% of the U.S. population, age 40–74 years
• 60% of all patients with CVD
• 50% of patients with confirmed coronary heart disease (CHD) and no prior history of diabetes
• 92% of patients with T2DM
Harris M, et al. Diabetes Care. 1998;21(4):518-524. Haffner SM, et al. Circulation. 2000;101:975-980.Kowalska I, et al. Diabetes Care. 2001;24(5):897-901.Haffner SM, et al. Am J Med. 1997;103:152-162.
Who Is Insulin Resistant?
How to Detect Insulin Resistance
Those with any of the manifestations of the metabolic syndrome:– Increased waist
circumference– Hypertension– Hypertriglyceridemia– Low HDL-C– Atherosclerosis– Impaired glucose
tolerance
Interrelation Between Atherosclerosis and Insulin Resistance
HypertensionHypertension
ObesityObesity
HyperinsulinemiaHyperinsulinemia
DiabetesDiabetes
DyslipidemiaDyslipidemia
Small, dense LDLSmall, dense LDL
InflammationInflammation
HypercoagulabilityHypercoagulability
InsulinInsulinResistanceResistance
InsulinInsulinResistanceResistance AtherosclerosisAtherosclerosisAtherosclerosisAtherosclerosis
Biological Functions of the Adipocyte
Fatty Acids Glucose
Fed
Fasted
Fatty Acids Glycerol
Leptin, FFA, TNF, IL-6,Adiponectin, Resistin, AngiotensinogenPAI-1, Other
Leptin
ANS
Secretory/Endocrine GlandInert Storage Depot
Kahn B, Flier J. J Clin Invest. 106:473 2000
Insulin
Steps in the Development of Diabetes
Defect in mitochondrial fat oxidation Excess energy intake
Increase fat in fat cell, muscle and liver
Insulin Resistance
Release of FFA and inflammatory markers from fat cell
Death of islet cell
Diabetes Mellitus
Screening for Diabetes and Prediabetes
Screen every adult > 40 years of age
100 - 125
Prediabetes
> 125
Diabetes
< 100
Normal
What Can You Do to Prevent Diabetes?
• If over 40, get screened with a fasting glucose level.
• If high risk or if glucose levels are over 100 mg/dl, start making lifestyle changes to improve diet and exercise.
• Talk with your health care provider about other cardiovascular risk factors
Health
Physical ActivityPhysical Activity
++
Sound NutritionSound Nutrition
Good HealthGood Health
HealthThe first part of our equation is activity
Get moving, find something you enjoy
Physical Activity Pyramid
Prescription pad
Prescription pad
Activities Log
Week # Activity # of Minutes
Mon
Tue
Wed
Thu
Fri
Sat
SunParticipant’s signature: Date:
HealthThe second part of the
equation is nutrition Your body needs the right fuel to help it
work well.
23 subjects with vascular disease were treated with diet low in starch and high in saturated fat. After 6 weeks, subjects lost 5% of bodyweight. Lipids were slightly improved, but homocysteine and CRPboth increased
Food Pyramid
Management of Obesity: Treatment Options
Modality Recommendation
Reduced-calorie diet Reduce energy intake by 500 to 1,000 kcal/day to achieve a weight loss of 1 to 2 lbs/week over a 6-month period
Start with 30 to 45 minutes moderate activity 3 to 5 days/week, and work up to at least 30 minutes moderate-intensity physical activity on most or all days/week
Use multiple behavioral strategies (eg, self-monitoring of eating habits and physical activity)
Recommend appropriate pharmacotherapy* for patients with BMI 30 kg/m2, or with BMI 27 kg/m2 with one or more comorbid conditions
Consider for patients with class 3 obesity, or class 2 obesity with comorbid conditions, for whom other treatments have failed
Increased activity
Behavior modification
Pharmacotherapy
Surgery
(NIH. Obes Res. 1998)
*In combination with diet, increased activity, and behavior modification.
Gastric Bypass Surgery for Obesity
Improvements in technique and“advertising” has resulted in aresurgence of interest in bariatricsurgery for treatment of obesity
1990 – 16,000/year2003 – 200,000/year
Healthy Lifestyle Improves All Cardiovascular Risk
Factors:Glucose
BPCholesterol
30-60 minutes/day
High fiber, low fat diet – 3 meals/day
Restrict:
CaloriesSaltSimple carbohydratesAnimal Fats
For Effective Weight Loss
• 30 – 60 minutes of exercise most days of the week– Mixture of cardiovascular and weight training
• Cut calories by about 30%• Do not restrict any one category too severely• Have realistic expectations – unusual for
people to be able to maintain > 20% weight loss for the long-term.
How Can You Help Reduce Your Risk of Diabetes?
Eat foods low
in fat & calories.
If overweight,
lose weight. Physical activity
Stop smoking!
Limit alcohol to 1-2 drinks per day.
Take your medications regularly.
What are goals to healthy living? Be SMART
Specific Measurable
AchievableRelevant Time
www.aace.com
www.diabetes.org
www.powerofprevention.com
www.fitness.gov
www.presidentschallenge.org
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