Obesity is a term that means you weigh at least 20% more than what is considered a normal weight for your height. It makes you more likely to have conditions including: Heart disease and stroke.
An Isotonic Solution creates a mild, less concentrated salt solution of 9mg of Sodium Chloride per mL of water, which has a similar salt concentration as your body and may be more comfortable to use for some people initially compated to the more concentrated Hypertonic solution.
If you're asking about what the term isotonic means...there are three basic types of solutions- Hypertonic, Hypotonic and Isotonic Hypertonic Solutions are solutions that contain more solute than the other solution in question. Hypotonic solutions are less concentrated with solute than the other solution