While it's generally good to keep tabs on it, your body weight won't be able to tell you the full story of your health.

When using chemical formula it is possible to calculate the percentage composition of the chemical. This can be useful when extracting metals from ores or when making fertilisers for specific plants.

For example, a person may weigh 170 pounds and have a body composition of 20 percent body fat, 12 percent bone, and 68 percent lean tissue mass. This means their body is made up of 34 pounds of ...