Which weighs more, bones and muscles or fat?

Bones and muscles collectively weigh more than fat due to their density. Bone is one of the densest tissues in the human body, and muscle tissue is also relatively dense compared to fat. Fat, while it occupies more volume than the same weight of bone or muscle, has a lower density. This means that for a given volume, fat weighs less than an equivalent volume of bones and muscles.

The composition of the body varies among individuals, but in general anatomical terms, the density and mass of bones and muscles provide a heavier weight than fat in a comparative scenario. Thus, when assessing the overall weight, bones and muscles outweigh fat.