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There are specific aspects not contemplated in current definitions of sarcopenia, as the role of fat, bone, or both which are still far to be settled [30]. They are discussed in detail in other chapters of this book. However, it seems pertinent to mention some aspects that are related to general definitions here.

Osteoporosis is a skeletal condition closely linked to sarcopenia, a condition that has been named osteosarcopenia. The coexistence of both conditions seems to increase the risk of falls and other outcomes associated with each condition alone [31]. There is still some discussion if osteosarcopenia should be defined by body composition (i.e. low muscle mass and low skeletal mass) or if muscle function should be part of the definition [32, 33].

Sarcopenia and obesity also coexist frequently in the so‐called sarcopenic obesity [34–37]. Increases in muscle fat and body weight have a strong influence in the accuracy and adjustment of most methods that estimate skeletal muscle mass. As in osteosarcopenia, a body composition approach (i.e. low muscle mass plus obesity defined as increased fat or by anthropometry) has coexisted in research with an approach that defines sarcopenia using functional measures, and efforts to refine the definition are under way.