I think it is wise to take into consideration the way that various chemicals and medications that have been introduced into our bodies that were never around before can impact this. For example back in the day I absolutely think that eating less and exercising more was the ticket to losing weight. I still think that is the case, but there are also instances where medications can impede that process as well as hormones that have been knowingly or unknowingly introduced to our food sources.
This is something that becomes very clear to you when someone close to you struggles with trying to get in shape and you see them start being more active and eating much healthier and they still don't see results.
i think that in many situations if someone close to you does those things and still doesn't lose weight they might be lying to you about what they are actually doing. There was this guy i knew Andy that was riding his bike HARD all the time, and claimed to be eating right but he was always at the bar drinking beer... not too difficult to understand what the real problem is there.
While I will admit there could be some isolated issues such as hormonal imbalances and certain diseases of the organs that could be the issue, for the most part this fat acceptance is dangerous because being obese is dangerous.
I'm not saying that anyone who is fat should be looked down upon or bullied... absolutely not. But to suggest that "it isn't your fault!" for 95% of overweight adults, is just a flat - out lie.