The flip-side of the problem of obesity in our modern society is our obsession with being skinny.
An overweight person who exercises aerobically (heart and lungs) on a regular basis will soon be far fitter than a skinny person who does not exercise, but only diets. Many overweight people are very fit, and many skinny people are very unfit. The bottom line is not how skinny you are, but how healthy and strong are your cardiovascular (heart, artery) and pulmonary (lung) systems.
Skinny people who do not exercise are setting themselves up for weak muscles, fragile bones, narrow arteries and other age related diseases.
Skinny is not always beautiful, and healthy overweight people are absolutely gorgeous!