What is metabolic syndrome, how is it linked to heart disease

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 What is metabolic syndrome and how is it linked to heart disease?
Metabolic syndrome is a grouping of traits and medical conditions that puts people at risk for both heart disease and type 2 diabetes. It is defined by the National Cholesterol Education Program as having any three of the following five traits and medical conditions:

Traits and Medical Conditions Definition
Elevated waist circumference Waist measurement of
40 inches or more in men
35 inches or more in women
 
Elevated levels of triglycerides 150 mg/dL or higher
or
Taking medication for elevated triglyceride levels
 
Low levels of HDL (good) cholesterol Below 40 mg/dL in men
Below 50 mg/dL in women
or
Taking medication for low HDL cholesterol levels
 
Elevated blood pressure levels 130 mm Hg or higher for systolic blood pressure or
85 mm Hg or higher for diastolic blood pressure
or
Taking medication for elevated blood pressure levels
 
Elevated fasting blood glucose levels 100 mg/dL or higher
or
Taking medication for elevated blood glucose levels.
 
Source: Grundy SM, et al. Diagnosis and Management of the Metabolic Syndrome: An American Heart Association/National Heart, Lung, and Blood Institute Scientific Statement. Circulation. 2005;112:2735–2752.
Note: Other definitions of similar conditions have been developed by the American Association of Clinical Endocrinologists, the International Diabetes Federation, and the World Health Organization.