Masterchef star Gregg Wallace has lost 4.5 stone after he ditched fast food, embraced home cooking, drank less alcohol and exercised regularly.
The 57-year-old presenter said he weighed 16st 7lb and was "overweight and wasn't happy" as he was too heavy for his frame of 5ft 8in.
Gregg said he wanted to lose weight to "look better on the telly", and with limited knowledge of nutrition, he found it difficult to shed the pounds.
He had tried "everything", from "fasting, no carbs, low fat" and several other restrictive diets.
Gregg admitted that these fad diets resulted in short-term weight loss but said it was "really uncomfortable" and he was "horribly hungry and miserable all the time".
"I learnt that it's far better to wean yourself off [a bad] diet slowly and cook proper, healthy meals, as you are far more likely to succeed and enjoy the change," he commented.
Healthy and balanced home-cooked meals, alongside regular exercise, meant Gregg lost a whopping 4.5st.
He cut out snacks, alcohol and takeaways from his diet and swapped them with "three large, filling, healthy, balanced meals every day".
As a result, "the weight came off".
Gregg's mindset and motivation have changed from wanting to look good for the public to "how fit can I actually get? Can I actually have the body of a 20-year-old at 60?"
Gregg is now on a mission to get a fit body and loves showing off his hard work.
Some people have told him "not to share topless pictures," but Gregg thought ", sod it, I'm going to do it".
He told The Sun it is "good to celebrate success", especially when "you have improved your health so dramatically," and that his six-pack pictures have "inspired" others to get fit and healthy.
Gregg also set up the fitness brand, Show Me Fit to help others lose weight.
During an Instagram Live, the TV star asked members and social media followers to "use Monday morning as a time for reflection".
"How was your weekend?" He asked. "It's ok to be indulgent - was it over-indulgent, and what lessons can you learn from it?
"I know for a fact that we can be really good during the week, then think we can blow out at the weekend, and that can very easily ruin the work you've done during the week.
"That was true of me when I started to lose weight."
He added: "All you've got to do is change habits. That fun [overindulging] can cost you your health, can keep you overweight and unhappy. You have to change."
"If you're not happy with your shape and size, you need to weigh yourself, so you know you've lost weight," he said.
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