How Does Energy Intake Change in China? A Life Cycle Perspective

Area of Science:

• Demographic analysis
• Nutritional science
• Food security policy

Background:

• China's population is characterized by fewer children and an aging demographic.
• These demographic shifts have profound, long-term implications for national and global food and nutritional requirements.
• Understanding household energy intake dynamics is essential for accurate food demand forecasting.

Purpose of the Study:

• To quantify the impact of population structure changes on energy intake in China.
• To reveal the characteristics of energy intake changes across the life cycle of Chinese residents.
• To inform food and nutrition security policies by accounting for demographic trends.

Main Methods:

• Introduction of adult equivalent scale (AES) variables into an energy intake model.
• Quantification of the impact of population structure on energy intake.
• Analysis of energy intake patterns across different age groups and life stages.

Main Results:

• Population structure changes significantly impact urban household energy intake in China (elasticity of 0.446).
• Elderly individuals (over 60) show a peak in energy intake before age 65, suggesting aging may decrease food consumption.
• Specific age groups (children 1-10, women 22-30 and 40-45) exhibit a decrease then increase in energy intake, possibly linked to childcare and body size management.

Conclusions:

• The average household size, adjusted for energy consumption via AES, is 2.341, smaller than the population-based 3.052.
• Predictions of food and nutritional demand must be adjusted for 'fewer children' and 'aging' trends.
• Accounting for life cycle energy intake variations is vital for effective food and nutrition security policies.