Yes and no. Yes, bodybuilders often follow six meals a day plan as well. But there is a difference where they are trying to get lean and gain muscle, whereas many following it are trying to lose weight and curb their blood sugar levels. Having said that, if you are trying to put on muscle and gain a healthy but lean weight, you can change your calorie intake and keep the same healthy foods.  The reason bodybuilders use this method is that it keeps their bodies continually digesting food. This can help with metabolism and keeps their body filled with nutrients that they need to perform and work out. If you are not working out as rigorously as they are, the method won't work as well.