Eat low carbs, lift weights. Be in good shape. Get told by a doctor you need to eat low fat and do aerobics.
In my best running days, my blood pressure was about 125 over 70. And that was a few years ago. Now that I have a cracked sesamoid bone in my foot, I can't run as much, so I do weights. Lower weights, higher reps, but weights none the less. My body weight went from 215 to 225, my waist stayed the same. Last time I got my BP checked it was 120 over 75. I don't care how much fat I eat. I avoid processed carbohydrates as much as possible, but I still eat a few. Plenty of protein. My post-workout "protein drink" is chocolate milk.
I'm in pretty damn good shape. Far better than some of the younger kids I deal with. And the people who can out-run me can't out-lift me.
This whole "eat low fat and run every day" thing? It's bullshit.