Preweaning nutrition and fat development in baboons

Area of Science:

• Primate nutrition
• Developmental biology
• Adipogenesis

Background:

• Early life nutrition is critical for long-term health.
• Adipocyte development is a key factor in regulating body fat.
• Understanding factors influencing adipocyte number is important for preventing obesity.

Purpose of the Study:

• To investigate the effect of preweaning food intake on adipocyte number in baboons.
• To determine if early overnutrition or undernutrition influences the total number of fat cells at weaning.

Main Methods:

• Two groups of newborn baboons (n=12 each) were fed concentrated or diluted Similac formula from birth to 18 weeks.
• Body weight and fat mass were measured.
• Adipocyte volume and number were directly measured in 10 fat depots and total adipocyte number was estimated.

Main Results:

• Baboons fed concentrated formula were 38% heavier and had 87% more fat mass than those fed diluted formula (P<0.01).
• Differences in fat mass were attributed to increased mean adipocyte volume (0.22 nl vs 0.09 nl) in overfed baboons.
• No significant diet effect was observed on the estimated total number of fat cells or in 8 out of 10 measured fat depots.

Conclusions:

• Preweaning caloric intake in baboons has minimal to no impact on the total number of adipocytes at weaning.
• Early nutritional interventions primarily affect adipocyte size, not the overall cell count, in this primate model.