Its called the rough endoplasmic reticulum (RER) because of its bumpy surface. Each bump is a ribosome whose job is to make proteins. The rough ER’s job is also to make proteins. If you think about how many proteins it takes to make and run the body, it is easier to understand why it’s called the rough ER.
Of course determining exactly how many proteins needed for each person depends on the person. Most experts say one needs about 1-2 grams of protein per pound of body weight. But it really depends on your body type and how active you are (ex: muscle requires a lot of proteins). Your doctor or nutritionist would be able to help you determine just how much proteins you need.