Truth is, if a coworker is shamed for their weight, in 99% of cases, it does not give them fuel to lose weight.
Instead, the shame will stress them, and make them fall back on their stress-coping habits.
Which is, for obese people, eating.
Wanna know the truth?
He didn't get in shape because he was motivated..
He got in shape because he was talked about, laughed at, talked down on, abused for his size, and judged.
He needed to prove himself and he did it.