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The calorie: myth, measurement, and reality
S B Heymsfield1, P C Darby, L S Muhlheim
1Department of Medicine, St Luke's-Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York 10025, USA.
The American Journal of Clinical Nutrition
|November 1, 1995
Summary
Accurate calorie assessment remains challenging due to limited methods for measuring human energy intake and requirements. Modern techniques like indirect calorimetry and doubly labeled water studies are improving our understanding of energy needs.
Area of Science:
- Human Physiology
- Nutritional Science
- Metabolic Research
Background:
- The calorie is often misunderstood due to widespread misinformation.
- Accurate, practical methods for assessing long-term human energy intake and requirements are lacking.
- This hinders a clear understanding of human energy balance.
Purpose of the Study:
- To clarify uncertainties surrounding human energy requirements.
- To demonstrate how advanced research methods can resolve long-standing questions about energy needs.
- To highlight the limitations of self-report methods in estimating energy requirements.
Main Methods:
- Utilizing modern respiratory-chamber indirect calorimetry systems.
- Analyzing results from human studies employing doubly labeled water.
- Investigating patients with endogenous obesity as a case study.
Main Results:
- Advanced methods are resolving uncertainties in human energy requirements.
- Studies reveal significant flaws in self-report methods for estimating energy needs.
- New research opportunities are emerging from accurate energy expenditure measurements.
Conclusions:
- Advances in measuring energy expenditure are crucial for understanding human energy requirements.
- Modern calorimetry and doubly labeled water studies offer more accurate assessments.
- These methods are essential for resolving long-standing questions in nutritional science.