postprandial glucose in diabetes time for action.6
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Editorial
Postprandial Glucose inDiabetes: Time for Action
Mohsen Eledrisi, MD
The number of patients with type 2 diabetes is increasingat alarming rates in developed and developing countries.1
Many patients with diabetes are not aware of the disease and
several years often elapse before the diagnosis is made. The
development of type 2 diabetes is characterized by insulin
resistance and a progressive decline in -cell function leading
to reduced insulin secretion. However, metabolic abnormal-
ities start before the development of diabetes mainly in the
form of postprandial hyperglycemia due to loss of first phase
insulin secretion, decreased insulin sensitivity and decreased
suppression of hepatic glucose production.2,3 Postprandial hy-
perglycemia is associated with deficiencies in several sub-
stances such as amylin, glucagon-like peptide-1 (GLP-1), and glucose-dependent gastric inhibitory peptide (GIP).4,5 In ad-
dition, it has been shown that there is a gradual loss of post-
prandial glycemic control that precedes a stepwise deteriora-
tion in fasting glucose levels with worsening diabetes.6
The review by Tibaldi7 on postprandial hyperglycemia in
patients with type 2 diabetes is important and timely. Epide-
miological data support the role of postprandial hyperglyce-
mia in the development of cardiovascular disease and overall
mortality in patients with impaired glucose tolerance and pa-
tients with diabetes.8–11 However, data on the effect of con-
trolling postprandial hyperglycemia on cardiovascular out-
comes in patients with type 2 diabetes are limited. It is
important to note that the commonly cited large randomized
clinical trial in this context, the STOP-NIDDM,12 has eval-
uated patients with impaired glucose tolerance—not diabetes.
The other cited study13 was a drug-efficacy and safety trial;
cardiovascular disease was not a primary outcome. The meta-
analysis14 that showed a favorable effect of acarbose on car-
diovascular disease had major issues in its statistical meth-
odology.15 As noted, data on glinides focused on carotid
intimal media thickness as a surrogate marker; further studies
with attention on clinical outcomes are needed.
So, from the clinical point of view, is it important for the
physician to monitor postprandial glucose levels? The answer
should be: Yes. When treating patients with diabetes, clini-
cians strive to achieve near-normal glycemic control to help
reduce the development and progression of long-term com-
plications. Glycemic targets in patients with diabetes have
traditionally focused on glycated hemoglobin (HbA1c) and
fasting glucose levels. However, in the last several years, the
role of postprandial hyperglycemia has received attention and
recent professional guidelines have appreciated this as an
additional target. This target is defined as a 2-hour postmeal
glucose of less than 180 mg/dL as recommended by the Amer-
ican Diabetes Association, while the American Association
of Clinical Endocrinologists and the International Diabetes
Federation recommend a level of less than 140 mg/dL. Post-
prandial hyperglycemia is observed frequently in patients with
type 1 and type 2 diabetes and can occur even when the
overall metabolic control appears to be reasonable.16,17 The
contribution of postprandial glucose to overall glycemic con-
trol becomes more prominent as HbA1c levels decrease to-
wards the target. Postprandial glucose contributes to overall
hyperglycemia by about 40% when HbA1c levels are more
than 9.3% and by about 70% when levels are 7.3%.18 In
fact, achieving normal fasting glucose levels can still be as-sociated with HbA1c levels that are over the desired target.19
This reinforces the proposition that control of fasting hyper-
glycemia is necessary but usually not adequate for achieving
HbA1c goals, requiring control of postprandial glucose. This
could have significant clinical implications. It is important to
remember that reducing the HbA1c level by only 1% can
decrease the risk of microvascular complications by 25% and
the risk of any diabetes-related end point by 21%.20
In conclusion, postprandial hyperglycemia has an impor-
tant role in the management of diabetes. Data on the clinical
benefits of approaches that specifically target postprandial
glucose are needed. Meanwhile, in addition to followingHbA1c and fasting glucose levels, clinicians should consider
monitoring postprandial glucose levels, particularly in pa-
tients who are getting close to their glycemic targets.
References1. Wild S, Roglic G, Green A, et al. Global prevalence of diabetes esti-
mates for the year 2000 and projections for 2030. Diabetes Care 2004;27:1047–1053.
2. Weyer C, Bogardus C, Mott DM, et al. The natural history of insulin
secretory dysfunction and insulin resistance in the pathogenesis of type
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3. Pratley RE, Weyer C. The role of impaired early insulin secretion in the
pathogenesis of type II diabetes mellitus. Diabetologia 2001;44:929– 945.
4. Fineman MS, Koda JE, Shen LZ, et al. The human amylin analog,
pramlintide, corrects postprandial hyperglucagonemia in patients with
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glycemic control precedes stepwise deterioration of fasting with wors-
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7. Tibaldi J. The importance of postprandial glucose levels as a target for
glycemic control in type 2 diabetes. Southern Med J 2009;102:60–66.
From the Division of Endocrinology and Metabolism, Department of InternalMedicine, National Guard Medical Center, Dammam, Saudi Arabia.
Reprint requests to Mohsen Eledrisi, MD, PO Box 4616, Dammam, SaudiArabia 31412. Email: [email protected]
Accepted August 13, 2008.
Copyright © 2009 by The Southern Medical Association
0038-4348/02000/10200-0010
10 © 2009 Southern Medical Association
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8. Cavalot F, Petrelli A, Traversa M, et al. Postprandial blood glucose is a
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NIDDM trial. JAMA 2003;290:486–494.
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cosidase inhibition as monotherapy in elderly type 2 diabetic patients. J Clin Endocrinol Metab 1998;83:1515–1522.
14. Hanefeld M, Cagatay M, Petrowitsch T, et al. Acarbose reduces the risk
for myocardial infarction in type 2 diabetic patients: meta-analysis of
seven long- term studies. Eur Heart J 2004;25:10–16.
15. Van de Laar FA, Lucassen PL. No evidence for a reduction of myocar-
dial infarctions by acarbose. Eur Heart J 2004;25:1179; author reply
1179–1180.
16. Bonora E, Corrao G, Bagnardi V, et al. Prevalence and correlates of
post-prandial hyperglycaemia in a large sample of patients with type 2
diabetes mellitus. Diabetologia 2006;49:846–854.
17. Erlinger TP, Brancati FL. Postchallenge hyperglycemia in a national
sample of U.S. adults with type 2 diabetes. Diabetes Care 2001;24:1734–1738.
18. Monnier L, Lapinski H, Colette C. Contributions of fasting and post-
prandial plasma glucose increments to the overall diurnal hyperglycemia
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prandial glycemia on overall glycemic control in type 2 diabetes Impor-
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Res Clin Pract 2007;77:280–285.
20. UK Prospective Diabetes Study Group. Intensive blood-glucose control
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Please see “Importance of Postprandial Glucose
Levels as a Target for Glycemic Control in Type 2
Diabetes” on page 60 of this issue.
“Music expresses that which cannot be said and onwhich it is impossible to be silent.”
—Victor Hugo
Editorial
Southern Medical Journal • Volume 102, Number 1, January 2009 11