The term "overweight" is used in two different ways. In one sense it is a way of saying imprecisely that someone is heavy. The other sense of "overweight" is more precise and designates a state between normal weight and obesity. The National Institutes of Health (NIH) now defines overweight in terms of the BMI (the body mass index) which is a person's weight in kilograms (kg) divided by their height in meters (m)squared. Since the BMI describes the body weight relative to height, it correlates strongly (in adults) with the total body fat content. Body mass index best defines obesity. A person's height and weight determines his or her body mass index. The body mass index (BMI) equals a person's weight in kilograms (kg) divided by their height in meters (m) squared (more information will be found later in the article). Since BMI describes body weight relative to height, there is a strong correlation with total body fat content in adults. An adult who has a BMI of 25-29.9 is overweight, and an adult who has a BMI over 30 is obese. Obesity has reached epidemic proportions in the United States. Over two-thirds of adults are overweight or obese, and one in three Americans is obese. The prevalence of obesity in children has increased markedly. This information can be published in our peer reviewed journal with impact factors and are calculated using citations not only from research articles but also review articles (which tend to receive more citations), editorials, letters, meeting abstracts, short communications, and case reports. The inclusion of these publications provides the opportunity for editors and publishers to manipulate the ratio used to calculate the impact factor and try to increase their number rapidly. Impact factor plays a major role for the particular journal. Journal with higher impact factor is considered to be more important than other ones.