I'm reasonably active as far as software engineers go: 10k+ steps daily and exercise 2-3 times/week.
My BMI is 28, which is in the overweight category, but I carry a fair amount of muscle along with my flab.
My diet is the hardest part to control. I live alone and spend a lot of time at the office, so I often eat takeout Chinese and other convenience food.
My point is that a lot of us HN-y folks probably lead comparable lifestyles. The kind that we may think aren't too unhealthy, but for at least some of us, that assumption is wrong. Please keep an eye on your blood pressure and your waistline. I wish I had started paying attention to this much sooner. Now I'm not sure whether I can still reverse the outcome.