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.
Another way to describe the two solutions in the example of above is to use the terms hypertonic and hypotonic. A hypertonic solution has more solutes and less water than a hypotonic solution. So, in the example above, the solution inside the cell is hypertonic to the solution outside the cell.