Energy metabolism during human pregnancy

Area of Science:

• Human Physiology
• Nutritional Science
• Reproductive Health

Background:

• Pregnancy necessitates significant physiological adaptations in maternal energy metabolism.
• Accurate estimation of energy requirements is crucial for optimal maternal and fetal health.
• Existing methods for calculating energy needs during pregnancy have limitations.

Purpose of the Study:

• To review and synthesize current knowledge on energy metabolism during human pregnancy.
• To present updated estimates of energy requirements throughout gestation.
• To evaluate the validity of energy intake data in pregnant populations.

Main Methods:

• Review of existing literature on pregnancy and energy metabolism.
• Analysis of basal metabolic rate (BMR) and total energy expenditure (TEE) changes.
• Assessment of diet-induced thermogenesis and physical activity during pregnancy.

Main Results:

• Estimates of energy requirements can be derived from BMR or TEE, yielding similar overall but differing trimester-specific results.
• Pregnancy influences BMR, TEE, diet-induced thermogenesis, and physical activity levels.
• Underreporting of energy intake (EI) is prevalent among well-nourished pregnant women.

Conclusions:

• Current methods for estimating energy requirements during pregnancy provide comparable total but varied trimester-specific distributions.
• Further longitudinal research is essential to accurately define energy needs across all trimesters of gestation.
• Addressing EI underreporting is critical for precise nutritional guidance in pregnancy.