That higher lean mass increases calorie expenditure is a well-established physiological fact, as metabolically active tissue requires energy at rest and during activity; therefore, no formal citation is needed.
The claim that higher lean mass aids in burning calories is a fundamental physiological truism (lean tissue has a higher metabolic rate than fat tissue). Following the prompt guidelines, trivially true everyday observations and foundational physiological facts are classified as common knowledge, so no citations are attached and the balance verdict is set to COMMON_KNOWLEDGE.