What is direct calorimetry precision nutrition?
                                
                                
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                                    4 min read                                
                            
                                The first law of thermodynamics, applied to biology, dictates that all energy used by the human body is ultimately converted to heat, making its measurement a direct proxy for metabolic rate. In the context of cutting-edge dietary science, this principle underpins the powerful but rare research technique known as direct calorimetry, which provides foundational data for personalized nutritional strategies.