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Summary

This study determined daily energy intake for stable body weight. The average daily energy intake was approximately 10,000 kilojoules, with weight changes observed with deviations.

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Published on: November 11, 2021

Area of Science:

Human physiology
Metabolic studies

Background:

Maintaining a constant body weight requires balancing energy intake with energy expenditure.
Individual energy balance can be influenced by various factors including sleep and physical activity.

Purpose of the Study:

To estimate the daily dietary energy intake required for an individual to maintain a constant body weight.
To quantify the relationship between energy intake variations and body weight changes.

Main Methods:

A single participant (n=1) self-monitored daily body weight, dietary energy intake, sleep patterns, and physical activity (running).
Data were collected over a period of self-isolation, with specific exceptions for regular exercise sessions.
Statistical analysis was performed to determine average energy intake and its correlation with weight fluctuations.

Main Results:

The participant lost approximately 1.07 kg during sleep and 0.57 kg after a 5 km run.
The estimated daily equilibrium energy intake for maintaining body weight was 10,286 kJ.
A deviation of approximately 40 mg in body weight was associated with every kilojoule above or below the equilibrium intake.

Conclusions:

Despite efforts to control variables, persistent variability in body weight was observed.
Accurate estimation of daily energy requirements for weight maintenance can be challenging due to inherent biological variability.