First off, I'm fat and proud. Why? Because I take a 35 minute walk with my dog, every day. I play with nieces and nephews at least 3 times a week. When I visit my uncle in the hospital, I take the stairs, all 6 floors, to see him. Admittedly, I eat only so-so.
Second, why does this matter? I've never gone to the hospital for an obesity-related reason. For my asthma? Yes. For the respiratory infections that asthmatics are prone to? Yes. Because I was fat and had a random piece of cellulite hurt? No.
Third, despite my exercise and slight increase in making better eating choices, there is only so much I'll ever be able to do. At one point, I weighed in at 310 lbs; I had, over the course of a year, gotten down to 195. That's a loss of 115 lbs. My point? Despite working a job that revolved around physical labor, eating PERFECTLY (yes, literally) and counting calories for about 2 years and maintaining it, I could not get LOWER than that 195 lbs.
195 lbs was still 40 lbs overweight for my height. In this case, genetics was coming into play; my parents and grandparents were ALL obese. Sometimes, good habits can only take you so far.
Fourth, on BOTH sides of my family, the following run rampant:
Diabetes; heart disease; high blood pressure; arthritis; oral health problems.
Despite my efforts, including exercise, improving upon my habits and brushing my teeth after every meal, this is a case where I may DELAY those things, but will likely still come into them. Why? Because genetics can dictate a great deal.