GLOSSARY TERM

Body Composition

Body composition is a clinical measurement that describes the percentages of fat, bone, water, and muscle in human bodies. Unlike the Body Mass Index (BMI), which only accounts for total weight relative to height, body composition analysis provides a detailed breakdown of what that weight actually consists of. This is crucial because two individuals with the same BMI can have vastly different health profiles based on their ratio of lean muscle mass to adipose tissue.

In the context of weight loss, the goal is to improve body composition by losing fat while preserving or increasing lean muscle mass. Muscle is more metabolically active than fat, meaning it burns more calories at rest. Monitoring body composition through tools like bioelectrical impedance or DEXA scans allows for a more accurate assessment of metabolic health and ensures that weight loss is coming from the correct sources, which is vital for long-term maintenance.

📄 Cite This Definition
Clark, R. (2026). Body Composition. In *CFP Weight Loss glossary*. https://glossary.cfpweightloss.com/body-composition
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Russell Clark, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

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