Final answer:
To compare daily energy expenditures to intake, average energy usage is calculated by dividing the total energy used over two days by 2, and the process is repeated for different demographic groups. Statistics on daily calorie consumption show an increase in both consumption and affordability. The energy required for producing food is significantly higher than the energy obtained from consuming it.
Step-by-step explanation:
Comparing Daily Energy Expenditure to Energy Intake
To compare estimated daily energy expenditures to the average daily energy intake, one must first calculate the average amount of energy used in a day. This can be done by dividing the total energy used over a given period, such as 2 days, by the number of days to find the daily average. This figure should be recorded for future analysis. To get a comprehensive view, it's useful to record the average energy use of different groups, such as 10 males and 10 females, and calculate the average energy used by each group over a 24-hour period.
Daily Calorie Consumption statistics indicate that both the amount of calories people consume per day and the amount that people can afford based on their working wages have increased. This information is critical in understanding how dietary habits are changing over time and can influence the comparison between calorie intake and energy expenditure.
An interesting fact mentioned is that modern agricultural practices entail a 10:1 energy expenditure on food production, meaning that each kilocalorie of food consumed requires ten times as much energy to produce. When considering a typical diet of 2,100 kcal/day, which translates to 2.4 kWh/day, the true energy investment to sustain such a diet is approximately 24 kWh per day.