Beyond Deterministic Fetal Programming: Intrauterine Exposures and the Multifactorial Origins of Adiposity

Area of Science:

• Human Physiology
• Developmental Biology
• Metabolic Health

Background:

• Excess adiposity is an ancient condition, with evolutionary adaptations in maternal and fetal physiology.
• Intrauterine environmental disturbances, particularly metabolic derangements in diabetic or obese pregnancies, can cause fetal hyperinsulinaemia.
• Fetal hyperinsulinaemia is linked to neonatal adiposity, potentially increasing the risk of childhood adiposity.

Purpose of the Study:

• To review evidence on mechanisms linking in utero exposure to childhood adiposity.
• To focus on pregnancies complicated by maternal diabetes or obesity.
• To critically evaluate the concept of fetal programming of adiposity.

Main Methods:

• Literature review of existing evidence.
• Analysis of factors moderating the in utero exposure-childhood adiposity association.
• Focus on human studies, particularly those involving maternal diabetes and obesity.

Main Results:

• Causal evidence for deterministic fetal programming of adiposity in humans is currently insufficient.
• An opportunistic framework, considering postnatal exposures and genetics, better explains excessive adiposity.
• Individual sensitivity to environmental factors varies with developmental stage.

Conclusions:

• The concept of deterministic fetal programming of adiposity requires re-evaluation in humans.
• Excessive adiposity is multifactorial, influenced by genetics, postnatal environment, and developmental timing.
• Further research is needed to establish causal links and inform interventions.