I think some of them are pretty accurate. I don't know which ones, but... essentially, they found the cause of certain illnesses were due to lack of certain nutrients (such as jaundice) and experimented to see how much of vitamin X was needed to stave off the illness. Then with certain vitamins/minerals, they found tolerable upper limits as well. Carbs are different because unless a person is diabetic, there isn't going to be an immediate, recognizable illness directly associated with consumption for a looong time.
If you are truly worried, get some testing done to see where your levels are of any nutrients you're worried about. Then eat more of vitamin/mineral X if you are low. Whole foods are best sources.
Type 1 Diabetic. Controlling blood sugar through primal life.
Maintain A1c of 6.0 or lower
More dietary fat, less carbs, moderate protein
LHT and sprint as per PB fitness