He is currently working with Loughborough University on a project that focuses on habitual changes that will help people lose weight and keep it off.
In his keynote address he will also give his views on the quality of catering within the public sector, how it can be improved and what the nation needs to do to move towards a more sustainable and better-quality diet.
He is just one of a number of speakers set to take part in the two-day event, which is taking place at the NAEC in Stoneleigh, Warwickshire from October 31 to November 1.
Gregg began his career in Covent Garden fruit and veg market, starting George Allen Greengrocers, a company that built up to a turnover of £7.5m.
Based on his business success, he was invited to co-present Veg Talk on BBC Radio 4 and later became the original presenter of Saturday Kitchen in 2002.
His other TV projects have included Eat Well For Less, Inside The Factory, Turn Back Time and Harvest for the BBC. He has also presented a travel series for ITV and several outings of Gregg’s Long Weekender for Channel 5.
He has written books, including his autobiography in 2012 Life On A Plate and most recently, in 2019, Gregg’s Italian Kitchen.
In 2020 he started his own Health and Fitness business ShowMeFit, which has become a successful brand working with people to live a healthier and sustainable lifestyle.
His presence at the PSC Expo adds to the programme of an event that aims bring together chefs and caterers from across the public sector who help to feed the nation healthy, nutritious and sustainable food.
As well as a lively speaker programme, there will be an exhibition of more than 100 suppliers, informative cooking demonstrations, and Exercise Joint Caterer (EJC) will once again be taking place alongside the Expo.
EJC is the flagship event for Armed Forces chefs and catering teams - a tri-service competition with a wide range of culinary classes that showcases the role military caterers play in the delivery of an effective armed force.
The PSC Expo is free-to-attend for those working within a public sector catering environment and you can register by visiting here.