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Diabetes
Diet?
The Sweet Truth about Diabetes?
What
Kind Of Diabetes Do You Have?
Why
Do People with Diabetes Require Special Diets?
The
two major forms of diabetes, type 1 and type 2, share a central feature:
elevated blood sugar levels due to absolute or relative insufficiencies of
insulin, a hormone produced by the pancreas. Insulin is a key regulator of
the body's metabolism. After meals, food is digested in the stomach and
intestines; carbohydrates are broken down into sugar molecules, of which
glucose is one, and proteins are digested into their constituents, amino
acids. Glucose and amino acids are absorbed directly into the bloodstream,
and blood sugar levels rise. Normally, this signals the beta cells of the
pancreas to secrete insulin, which pours into the bloodstream. Insulin, in
turn, enables glucose and amino acids to enter cells -- importantly,
muscle cells -- where, along with other hormones, it directs whether these
nutrients will be burned for energy or stored for future use. As blood
sugar falls to pre-meal levels, the pancreas reduces the production of
insulin, and the body uses its stored energy until the next meal provides
additional nutrients.
In
type 1 diabetes, also known as insulin-dependent or juvenile-onset
diabetes, the cells in the pancreas that produce insulin, known as beta
cells, are gradually destroyed; eventually insulin deficiency is absolute.
Without insulin to move glucose into cells, blood sugar levels become
excessively high, a condition known as hyperglycemia. The sugar, which the
body cannot use without insulin, spills over into the urine and is lost.
Weakness, weight loss, and excessive hunger and thirst are among the
consequences of this "starvation in the midst of plenty".
Patients become dependent on administered insulin for survival. Dietary
control is very important and must focus on balancing food intake with
insulin intake and energy expenditure from physical exertion.
Type
2 diabetes, also known as no insulin-dependent or maturity-onset diabetes,
is by far the more common type of diabetes. Most type 2 diabetics produce variable even
normal amounts of insulin, but are insulin resistant; that is, they have
abnormalities in liver and muscle cells that block its action. Many type 2
diabetics, however, seem to be incapable of secreting enough insulin to
overcome this resistance; it is likely in such cases that there is an
additional defect in insulin secretion by the beta cells. Obesity is
common in type 2 diabetics and this condition appears to be related to
insulin resistance. The primary goal for overweight type 2 patients is
weight loss and maintenance.
People
with both types of diabetes are at risk for a number of medical
complications, including heart and kidney disease. Dietary requirements
for diabetes must take these disorders into consideration
What
Are the General Guidelines for a Diabetes Diet?
What Are the Guidelines for Major Food
Components in a Diabetes Diet?
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