If we check the weight of a woman, say somebody has a weight of 70 KGs and a height of 5′-10″. Another woman who is also 70 KGs but only 5′-2″ in height. There is a significant difference between both of them though the weight is the same. Because of this, the scientific community has defined a word called Body Mass Index. It is a ratio between weight and height which gives a more significant value known as body mass index or BMI. This value tells us about health status and picks up any risk factors such as obesity in the couple.