I think that there is also a lot of denial when dealing with obesity. And portion size is definitely a culprit. Fruits and veggies are a great alternative to junk food, but it still has to be in moderation.
I, personally, think that it also has to do with the hormones in our milk and meat products. With all of the steroids and antibiotics that they put into those cows, I think it absolutely has an affect on humans who are consuming it.
I agree with this completely. I am large framed and currently about 15 or 20 lbs over my ideal weight (I can thank the holidays for an extra 5). I *used* to be almost 50 lbs over my ideal weight. I thought I was eating healthily. And I was eating lots of veggies and fruits, whole grains and lean meats. But I was eating double or triple the serving size for so many things. I just assumed that I was genetically pre-determined to be a bigger girl. After all, my dad was huge (now much closer to his ideal weight, thanks to diet and exercise, after learning he has diabetes), his whole family was huge, my mom is a little overweight (15 lbs. maybe), but her mom is a plus-size woman, and my aunt and her family are all obese, too.
Once I started couonting calories and measuring out my food, I was shocked at how much "extra" healthy food I was eating. For dinner, I routinely ate 8 - 10 oz. of lean chicken, fish or steak, instead of a more appropriate 4 - 6 oz. serving. I was eating a full cup of wild rice or other grain, rahter than a half cup. I was eating 2 cups of breakfast cereal, or granola

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instead of the 1 cup or 4 oz. serving size. Sure, it wasn't chips and ice cream, but it was still TOO MUCH FOOD.
The other big thing is exercise. When I was 50 lbs. overweight, I was severely depressed and didn't do much. I watched A LOT of TV. Now, I walk during my lunch break, jog with my dogs at night, and try to work in at least 2 days of strenght training each week. It makes a huge difference.
I strayed off a bit for the holidays, but jumped right back in once I got home. When I first started measuring my food and exercising more, it was really hard. After a couple of days, I was ready to give up and buy a pint of Ben & Jerry's and be done with it, and resign myself to a life of size 16 clothes. But after about a week, I found that I really wasn't hungry for snacks, and it was impossible to eat big restaurant-sized meals without feeling like yakking.
While I sympathize with everyone who is obese, and applaud their efforts to better themselves, I think our society does its obese members no favors. I know in school, the "fat kid" was 20-30s bigger than the average, and was teased. Fat rolls were hidden under roomy shirts. There were no "cool" plus-size clothes; you had to buy things at the "pretty plus" section of Sears and JCP. Nowadays, you can't go to the mall without seeing girls and boys who are easily 50 - 60 lbs. too heavy, wearing clothes which does ntohing to hide it. It is good that these kids are not being made to feel as badly as I did for being chubby as a tween, but I fear the strenght of the "fat acceptance" movement prevents anyone [except maybe their doctors, if they even going for regular check-ups] from telling them like it is - they need to lose weight and develop healthy habits now to prevent health problems later.