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 hypotonic solutions, where the concentration of solutes is lower outside than inside the cell, water flows into cells and makes them swell. In hypertonic solutions, on the other hand, osmosis makes water flow out of cells, which shrivels them up.