Final answer:
Lean tissue refers to muscles, organs, bones, and body water, with 1 lb of lean tissue being about 0.45 kilograms. It's measured through body composition analysis, not just by weight.
Step-by-step explanation:
The question 'how much is 1 lb of lean tissue' relates to human body composition and can be categorized within the field of Health. Lean tissue, also known as lean body mass, includes muscles, vital organs, bones, and body water. One pound of lean body mass is equivalent to approximately 0.45 kilograms. However, measuring lean body mass is typically done using body composition analysis techniques rather than by simple weighing, as it involves differentiating between fat and non-fat components in the body.