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.
In an isotonic solution, water flows into the cell at the same rate at which it flows out. The pressure pushing the cell's membrane against its wall is reduced and the cell is said to be 'flaccid'. When a cell is placed in a hypertonic solution water actually flows out of the cell into the surrounding solution.