The professional dancer said he was shocked about the level of criticism he has received, making his comments as his latest business move - a partnership with the company formerly known as Weight Watchers - was announced.
He said: “I had an amazing time in the villa, it felt like an eight-week holiday.
“My body changed shape because I wasn’t eating well or exercising.
“I certainly didn’t expect to see the level of criticism I received when I left."
The reality star has been made an ambassador for WW, formerly Weight Watchers, joining fellow celebrity ambassadors Robbie Williams and Alison Hammond.
He said: “I have never been overweight, but have seen my weight yo-yo throughout my childhood, and it can spiral out of control when I am off the road and not performing.
“I have tried many ‘crash’ diets but none of them have worked for me. They don’t allow me to eat properly so I find myself binge-eating and the weight piles back on. This makes me feel really low and I lack motivation.
“I am really excited to join WW as an ambassador and pleased to be following a programme that’s right for me.
“For me this isn’t just about losing weight, it’s about being a healthier version of me. I want to build healthy habits that allow me to adopt the right mindset, and sustain a healthier and active lifestyle that fits around my schedule.”
Jemma Banks, marketing director at WW UK, WW, said: “We are so happy Curtis is joining our WW family and are looking forward to supporting him on his journey in transforming his relationship with food and wellbeing. We know his infectious energy and positive mindset will definitely help inspire others to adopt healthy habits.”
Additional reporting from Press Association