As my friend group has hit our 40s, I'm hearing from more and more friends that being thin and exercising a lot just doesn't hide the nutritional sins the way it used to. I've got several friends who are new to either blood pressure or cholesterol meds despite looking like the picture of heath due to their exercise habits that kept the weight off (one is a runner with The. Worst. eating habits I've ever seen - she legit eats like a college kid, all pizza and wings and ramen, but doesn't gain an ounce!).
I've been lucky that my own numbers are still in the normal range, though near the top of it, but I've started making some changes anyway because my mother had a horrible experience with statin side effects and I figure it is easier not to get to the point of needing them than to try to reverse numbers that are already high.