Visceral obesity and diabetes

Area of Science:

• Endocrinology
• Metabolic Syndrome
• Body Composition Analysis

Background:

• Obesity is a complex metabolic disorder with varying fat distribution patterns.
• Subcutaneous and visceral adipose tissue depots exhibit distinct metabolic and cellular characteristics.
• Understanding these differences is crucial for elucidating obesity-related health risks.

Purpose of the Study:

• To investigate the metabolic and cellular differences between subcutaneous and visceral obesity.
• To analyze the relationship between fat distribution and glucose metabolism.
• To assess lipolytic activity and enzyme function in different adipose tissue depots.

Main Methods:

• Computed tomographic (CT) scans were used to quantify subcutaneous and visceral adipose tissue areas in 155 subjects.
• Subjects were categorized into subcutaneous or visceral obesity groups based on the subcutaneous/visceral fat area ratio (S/V ratio).
• Metabolic studies, including oral glucose load tests, and in vitro fat tissue analyses were performed.

Main Results:

• Visceral obesity was associated with reduced glucose tolerance and increased insulin response.
• Fat cell size differed, with larger omental fat cells in visceral obesity and larger subcutaneous fat cells in subcutaneous obesity.
• Omental fat from visceral obesity patients showed higher isoprenaline-stimulated lipolysis, while subcutaneous fat had higher lipoprotein lipase activity in both groups.

Conclusions:

• Visceral obesity presents a distinct metabolic profile with impaired glucose regulation.
• Fat cell size and lipolytic responses vary significantly between subcutaneous and visceral adipose tissue depots.
• The S/V ratio serves as a valuable discriminator for obesity subtypes and their associated metabolic consequences.