I thought the diet comparisons here were rather useful: COMPARE 12 WEIGHT-LOSS DIETS DASH is apparently considered middle of the road (how boring!!!).
I'm 59 without any major health issues. In contrast, my husband is full up and I don't want to go through any of what he has so I'm having to learn what I can to care for myself. Part of the learning curve is understanding that doctors are clueless, just like veterinarians are, about matters like nutrition. Knowing that my primary is a DASH advocate and hubby's cardiologist is a Pritikin junky (in spite of hubby's diabetes) is important as a filter to whatever other advice they give. Helps put it into perspective. Sort of as a hobby, I home monitor in whatever ways I conveniently can to get a better idea of what is working for me (or hubby or my cats).