The Cotswolds farmer was at CountryTastic, held at the Three Counties Showground, at Malvern.
The BBC presenter is a regular at the annual event which is a highlight of the regional show calendar and helps to reconnect thousands of children and adults with food, farming and the countryside.
The event on 9 April brought people face to face with livestock and food producers and showed the best the countryside has to offer.
Adam, of Cotswold Farm Park, stopped off at the NFU Let’s Talk Farming stand and endorsed Great British Food Gets My Vote, speaking with farmers and others on the stand.
The campaign aims to demonstrate public support for the industry, to help ensure the next government and politicians make food and farming a priority.
Mr Henson said: “I would fully endorse the campaign as Great British food is something I’m absolutely passionate about.
“Here in Britain we have amazingly tight rules and regulations and we do have world beating standards in terms of what we produce, for animal welfare and in so many other areas including staffing, the way we manage inputs and even treat waste.
“I know British food sometimes comes at a price but people do back it when they can.
“British produce not only tastes pretty good but I believe it can be affordable and can compete with imports.”