Nowadays more and more people are asking how to lose weight, but there are those who wonder how to gain weight even though there's less of them ... The fact that someone wants to gain weight is mostly a personal decision and opinion to be so. By a medical stand skinny people are those who are 33 lbs ( 15 KG ) or more below the ideal body weight. Most common reasons for thinness are usually poor appetite, interference with the functions of your digestive...