| BMI | Body Mass Index |
| DLW | Doubly Labeled Water |
| FAO | Food and Agriculture Organization of the United Nations |
| FM | Fat Mass |
| FFM | Fat Free Mass |
| IAEA | International Atomic Energy Agency |
| IOM | Institute of Medicine |
| IRMS | Isotope Ratio Mass Spectrometry |
| PAL | Physical Activity Level |
| TBW | Total Body Water |
| TEE | Total Energy Expenditure |
| UNU | United Nations University. |
| WHO | World Health Organization |
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