TV Health Gurus Dr. Andrew Weil and Dr. Phil

Read another article today on TV Health Guru Dr. Andrew Weil and was pondering the following: Why should anyone take health advise from obese/overweight doctor personalities like Dr. Weil or Dr. Phil who don't practice what they preach ? It's common knowledge that the closer one is to their BMI (body mass index) the lower the chance of all major health issues (cancer, high blood pressure, diabetes etc). They tell us what to do but they don't seem to do it themselves. I wonder if they run on a daily basis ? Just my 2¢