Case Study 2 - 30 year old male building lean mass
This is the fat-free mass graph of a 30 year old male who managed to increase his lean mass by 11.5 kg over a 2.5 year period.**
Fat-free mass refers to bone and lean mass combined. His bone (as expected) did not significantly change over the timeframe in question. So, the change reflects his lean mass. Note that lean mass is not only muscle mass. It includes everything that's not bone or fat. That is, skin, organs, water, contents of stomach and bowels at the time of the scan, and muscle.
Generally, the 3 categories that can change are muscle, water, and stomach/bowel contents. One thing to mention also is that carb content of the diet leading up to a scan can make a difference. The more carbs in the diet the more glycogen (and therefore water) storage in the muscle. So, from measurement to measurement any change in lean can possibly reflect a few things going on. However, over a longer timeframe such as this, any fluctuations in the non-muscle components of lean will be negligible. The point is that most (or all) of the 11.5 kg is likely to be muscle.**
The other interesting aspect to this result is what happened to his fat mass. You can see from the graph above that over that 2.5 year period his fat mass increased by only 1 kg. There was an increase up to 13 kg at one stage, but overall he managed to substantially increase lean mass whilst basically maintaining fat mass. **
** Results may vary based on each patient’s physical health, diet and exercise, and adherence to their program. The weight loss results described are not typical for every individual.