Body composition analyses in normal weight obese women

Area of Science:

• Human Physiology
• Body Composition Analysis
• Metabolic Health

Background:

• Normal weight obesity (NWO) is a growing concern, characterized by excess fat mass despite a normal body mass index (BMI).
• Understanding the distinct body composition and metabolic profiles of NWO individuals is crucial for targeted health interventions.
• Existing BMI classifications may not adequately identify individuals at risk due to altered body composition.

Purpose of the Study:

• To identify novel body composition indices for characterizing normal weight obese (NWO) women.
• To compare body composition and resting metabolic rate (RMR) between NWO, nonobese, and preobese-obese women.
• To explore potential health implications and preventive strategies for NWO individuals.

Main Methods:

• Body composition was assessed using dual-energy x-ray absorptiometry (DXA) in 75 healthy Italian women.
• Resting metabolic rate (RMR) was measured via indirect calorimetry.
• Statistical analyses were performed to compare groups and identify significant body composition indexes.

Main Results:

• NWO women exhibited significantly higher body fat percentage and lower leg lean mass compared to controls.
• NWO women had a significantly lower RMR than both nonobese and preobese-obese women.
• Three new indexes—abdominal, leg, and trunk—significantly differentiated NWO individuals from other groups.

Conclusions:

• NWO women share anthropometric characteristics with obese women, including elevated body fat and altered lean mass distribution, despite normal BMI.
• Novel body composition indexes can effectively identify NWO individuals within the general population.
• Dietary and physical activity interventions may be beneficial for NWO individuals to mitigate risks of diabetes and cardiovascular diseases.