Energy restriction in obese subjects impact differently two mitochondrial function markers

Area of Science:

• Metabolic research
• Obesity studies
• Mitochondrial function

Background:

• Obesity is characterized by excessive fat deposition, cytokine overproduction, and oxidative stress.
• Energy availability, including adenosine triphosphate (ATP) levels and mitochondrial function, remains poorly understood in obese individuals.
• Understanding these factors is crucial for developing effective anti-obesity strategies.

Purpose of the Study:

• To evaluate changes in energy metabolism in obese subjects after an 8-week balanced-hypocaloric diet.
• To assess alterations in ATP content, mitochondrial function, and biomarkers of inflammation and oxidative stress.
• To investigate the utility of minimally invasive methods for monitoring metabolic changes.

Main Methods:

• Recruited 19 obese subjects for an 8-week balanced-hypocaloric diet intervention.
• Measured ATP content in leukocytes.
• Assessed mitochondrial function using the 2-keto[1-13C]isocaproate breath test (KICA-BT).
• Analyzed inflammatory and oxidative stress biomarkers.

Main Results:

• Subjects achieved significant weight loss (-5.55 +/- 2.88%).
• Hypocaloric treatment decreased leptin levels and lipid peroxidation.
• Leukocyte ATP content increased significantly (p < 0.05).
• KICA tracer mitochondrial oxidation decreased (p < 0.05) after weight loss.

Conclusions:

• A hypocaloric diet positively impacts energy metabolism and mitochondrial function in obese individuals.
• Minimally invasive methods effectively detect diet-induced changes in mitochondrial function.
• Findings provide insights into oxidative processes in weight homeostasis and suggest potential therapeutic targets for obesity.