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morning, beyond the fat. there is a new study suggests obesity crisis in america may be worse than we thought. i know it's not what you wanted to hear. bmi, a ratio of height to weight they used that that categorize people as overweight or obese. some say the current thresholds under estimate the problem. four in ten adults whose d bmi that are considered overwheat would be considered obese if their body fat percentage was taken in account. we can't ignore this, because all that extra weight is cutting decades off of peoples lives. if that sounds over the top or extreme, trust me, it...

Nowadays. because i know the reality. but i mean, what were you thinking when you saw him eating that much? >> as a parent, you know, you want to see your kids happy. and mistakingly, horribly mistakingly, when we were eating, we were happy. somehow that computed to being a good parent. >> reporter: tiger's dad wishes he had known this one startling fact, children with an obese parent are 50% more likely to be obese themselves. 50%. i think a lot of people focus on what you look like on the outside of your body. have you ever thought about what's going on on the inside of your body? >> not muc...

Body. for me as a doctor, this is especially disturbing, because we see this with patients who are typically decades older. that's the top of your femur. that's the bone right here that goes into your hip. and it is pushing against the bone over here. you should have a nice layer of cartilage in between here. nice cushion. and because it's so much weight, that bone is literally pushed back. and into that joint. that's going to hurt. of course, your joints hurting is not nearly as frightening as what all that fat is doing to your heart. this heart is having to work so hard, that muscle is getti...

>> hi, how are you? >> how are you all doing? just 12 years old and 250 pounds. tiger green has a story. call it the new american story. >> in our family, when you're happy, we eat. when you're sad, you eat. and when you just are watching tv, you eat. >> reporter: what did you eat? >> lunch, i have like a big 15-ounce steak or something. and like five sprites. stuff like that. >> reporter: five sprites? one meal? i'm almost scared to ask about dinner. what was that like? >> take lunch times five. >> reporter: it's hard not to smile. but also important to realize that tiger didn't get here by h...

After a while, it won't be able to work as well. >> it's scary, i know it could be happening to me right now. >> reporter: what we're talking about isn't theoretical. it's a really happening now. tiger told mae story that stuck with me. when he was in second grade, he started to have chest pains. doctors were concerned enough about his heart he ended up in a place like this, checking his heart and doing procedures and tests to try to figure out what was going on. a second grader, all of this because of overweight and obesity. can you imagine as a child ending up in a room like this, doctors ar...