The 42-year-old catwalk queen will serve as a judge and mentor on the upcoming US competition, which will give undiscovered talent the chance to land a modelling job, reported Contactmusic.
"I eat very healthy. I didn't always, but I do now. Listen, I'm doing The Face now so for me... I know that TV is supposed to make you look bigger, so I'm very disciplined in this period!" she said.
Campbell, who is also an executive producer on the show, said she is surprised by how gruelling her new venture is.
"Television's hard work. It's not like we go and do the shoot and we leave. It's, like, many gruelling hours... (but) I am enjoying it. I would love girls to be empowered by the show so that they find things - whether they make it as a model or not - that implement in their life (to help with) self-esteem issues," she added.
'The Face' is due to begin from next year.
