Another shortcoming is that it is not applicable to certain very muscular people such as athletes and bodybuilders, who can also have artificially high BMIs.

Examining the period 1870-1920, Keyssar concentrates on Massachusetts, where the historical materials are particularly rich, and the findings applicable to other industrial areas.

It is applicable to softening conditioning shampoo, hair conditioner, hairdressing gel, elastin, hairstyling gel.