<p><b>Weight loss</b>, in the context of medicine, health, or <a title="Physical fitness" href="https://en.wikipedia.org/wiki/Physical_fitness">physical fitness</a>, refers to a reduction of the total <a class="mw-redirect" title="Body mass" href="https://en.wikipedia.org/wiki/Body_mass">body mass</a>, due to a mean loss of fluid, body fat or <a title="Adipose tissue" href="https://en.wikipedia.org/wiki/Adipose_tissue">adipose tissue</a> and/or lean mass, namely bone mineral deposits, muscle, tendon, and other connective tissue.</p>