In a memoir, I think, the contract implies a certain degree of truth. I think you have to be as true to your memory and your experience as you possibly can.
“I was this role model for heavy people. But the thing is, I never set out to be a role model at all, and I don't set out to be one now. I won't preach to anyone and tell them how to lose weight. I don't know any better than the next person.”