Eat right and be active. Starving and vomiting are very bad for you, anorexia has the highest death rate of any psychological disorder, due to its effects on the body, including growth stunting, hormonal imbalances, heart disease, seizures, intestine complications, such a infractions, and perforations.One may wish deeply to be as skinny as possible, but sickly frail people are not attractive. There is no magic formula for health, the only way is to eat right and exercise, and they call it being "out of shape" for a reason (also applicable to the underweight, as well as overweight), because exercise shapes the body into a healthy form, and what is attractive in people is health and happiness.Also, starving yourself will lower your metabolism, making you retain more from whatever food that you do it, it is best to eat small, handful sizes portions of food, about nine times a day, and exercise for at least an hour straight for a day, and a couple minutes an hour otherwise. Sitting for over an hour can also reduce your metabolism by up to 90%, whereas not only do you burn calories during an exercise, but there is also an after burn that lasts for the rest of the day. My exercises of choice are yoga, and dancing.