Let me guess, the person who wrote the article saying that only 10% is genes has a new diet or exercise program to sell us? One that will make us all look like Heidi Klum while only stretching for 10 minutes a day and taking a supplement?? LOL.
I guess I think that about 50% is genes. I've sometimes been very strict with my diet, trained very hard, done P90x, and my body did change a little bit, but really, I was just a slightly smaller, or slighly more muscular, version of myself. Right now I'm eating what I want, have gained 10 lbs., am enjoying just doing AWT, walking and yoga, and I'm not noticing a huge disintegration of my appearance. I feel like I'm still me, with my basic body type, no matter what I do. I have two cousins and niece who all share this type of body (although neither of of our mothers had our type body, so it comes from some other genetic strain in the family), so I do think a lot of it is just the luck of the draw.
I am a volunteer dog-walker at our animal shelter once a week, and I think humans are a little like dog breeds. The pugs are going to be chubby no matter how much you restrict their diet. Even though they are the same height as the sleeker little terriers, they are roly-poly and are not built for speed. And the greyhounds, although they are the same height as a labrador, are never going to be muscular enough with enough body fat to enjoy swimming in icy currents. There is diversity in the world and a fair amount of that is determined genetically.
I was watching 20/20 last night and they were interviewing McCain, Obama, and their spouses. Michelle Obama was joking that her hubby is naturally thin, "is the type that says "I just can't gain any weight no matter what I do!" and Michelle always tells him "Honey, I can show you how, I know how to gain weight, it's easy, no problem!"