Obesity bias needs to be fixed. We are most likely to fix it when standing on a solid bedrock of understanding it at its origins. We can then replace the crude and obsolete survival-related imperatives bestowed to us in our genes, with the better angels of our nature.
The conversation I would like to have about obesity is about acceptance and being kind to each other. By all means, make a commitment to better health by attaining your ideal weight if you can, but leave the self- and other-loathing at the refrigerator door.
Prejudice against the obese is the last "acceptable" prejudice in America. The overweight are treated differently. They're looked at differently. They're stared at, sneered at, and discriminated against.
Weight does not measure human worth. It is not an indicator of character. Bathroom scales are not designed to weigh merit. The boy in the Nike ad may well be full to the brim with greatness -- but none of it has anything to do with running.
We need to stop blaming, hating and discriminating against obese people, but equally important, we need to use what we know to solve obesity and the obesity epidemic. That is the real solution to the evil of obesity bias.