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Day-to-day weight changes in young men.

O G Edholm1, J M Adam, T W Best

  • 1Division of Human Physiology, National Institute for Medical Research, London.

Annals of Human Biology
|January 1, 1974
PubMed
Summary

This study looked at how body weight changes from day to day in 140 young soldiers. Researchers tracked food intake, physical activity, fluid balance, and fecal mass over 2087 occasions. They found that 32% of weight changes were 0.5 kg or more, with 6.2% reaching 1.0 kg or more. Large weight shifts were often linked to unusual food intake or activity levels. Fluid balance correlated with weight changes when measured. Fecal mass varied but had limited impact on weight fluctuations. The researchers concluded that irregular defaecation is only a minor cause of weight irregularity. Their findings suggest that food and activity are more important factors than hydration or digestion in daily weight changes.

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Area of Science:

  • Human physiology and metabolism
  • Nutritional science
  • Physical activity and health outcomes

Background:

Variability in body weight across days is a common observation, yet its underlying causes remain poorly understood. Prior research has shown that factors like food intake and physical activity influence weight fluctuations. However, the extent to which these factors contribute to significant changes remains unclear. No prior work had resolved how much of the daily weight variation is due to fluid balance or fecal mass. That uncertainty drove the need to examine weight changes in a controlled setting. The study aimed to clarify the role of energy intake, expenditure, and fluid balance in daily weight shifts. It was already known that short-term weight changes often reflect hydration and digestion. This gap motivated the investigation of these variables in young men. The researchers sought to determine whether irregular defecation could explain most weight fluctuations. Their findings may help distinguish between transient and meaningful weight changes.

Purpose Of The Study:

Keywords:
body weight fluctuationsyoung male healthweight trackinghydration and weightphysical activity effects

Frequently Asked Questions

The study found that irregular defaecation contributes only minimally to weight fluctuations. Large weight changes were more often linked to food intake and activity levels.

Fluid balance was calculated as fluid intake minus urine volume on days when both were measured. It showed a significant correlation with weight changes.

Fecal mass varied between 75 and 210 grams, but the researchers concluded it had limited influence on weight irregularity.

Food intake was significantly correlated with weight changes. Unusual food consumption was linked to 7% of large weight shifts.

Related Experiment Videos

The study aimed to investigate the causes of day-to-day weight changes in young men. It focused on identifying whether factors like food intake, activity levels, and fluid balance could account for significant weight fluctuations. The researchers sought to quantify how often these factors contributed to changes of 0.5 kg or more. They also wanted to assess the role of fecal mass in weight variation. The study was conducted in a controlled setting with soldiers, who likely had consistent routines. This allowed for tracking of food intake, activity, and fluid balance. The goal was to determine if irregular defecation could explain most weight changes. The findings may help clarify the importance of hydration and digestion in daily weight shifts.

Main Methods:

The study monitored 140 young soldiers over time, recording their body weight changes on 2087 occasions. Researchers tracked food intake, energy expenditure, and physical activity levels for each individual. Fluid intake and urine volume were measured on selected days to assess fluid balance. Fecal mass was also recorded to determine its contribution to weight changes. Correlations were calculated between weight changes and these variables. Large weight changes were defined as 0.5 kg or more. The data included days of high or low activity and unusual food intake. The analysis focused on how often these factors coincided with significant weight shifts.

Main Results:

Of the 2087 weight changes, 32% involved shifts of 0.5 kg or more, with 6.2% reaching 1.0 kg or more. Weight changes correlated significantly with food intake and energy expenditure. Large weight changes were linked to 11% of days with extreme activity levels and 7% with unusual food consumption. Fluid balance showed a significant correlation with weight changes when measured. Fecal mass varied between 75 and 210 grams across measurements. Irregular defecation accounted for only a minor portion of weight fluctuations. The study found that hydration and digestion had limited influence on daily weight shifts. These findings suggest that other factors may drive most weight changes.

Conclusions:

The researchers concluded that irregular defaecation contributes only minimally to day-to-day weight changes. They found that fluid balance and fecal mass had limited impact on significant weight shifts. The study suggests that food intake and physical activity are more important factors. However, these variables explained only a small proportion of large weight changes. The authors propose that other unmeasured factors may influence weight fluctuations. Their findings do not support the idea that hydration or digestion are primary drivers of daily weight changes. The study highlights the need for further research into other potential causes. These conclusions align with the observed data and the study's design.

Of 2087 weight changes, 32% represented shifts of 0.5 kg or more, with 6.2% reaching 1.0 kg or more.

The authors proposed that food intake and physical activity are more significant than defaecation or fluid balance in driving weight changes.