The former Health Secretary - who was forced to resign from government after his affair with advisor Gina Colangelo was exposed - revealed he turned down an offer from ITV to take part in the reality show twice, before making a last minute U-turn last week.
Hancock, who has arrived in Australia, told The Sun newspaper: "The truth is, I haven’t lost my marbles or had one too many pina coladas. It’s something I’ve given a lot of thought to. I was elected by the people, and it’s important to engage with voters, especially younger voters, no matter where they are, and show the human side of politicians."
The 44-year-old father-of-three is still an elected MP for West Suffolk, meaning he is being paid an annual salary to serve his constituents.
He said his constituents are "still my first priority" and revealed he has agreed with producers that he can be reached at any point during filming if any "urgent constituency matter" arises.
Hancock also promised he will hold a surgery with his constituents as soon as he returns from the camp.
He said: "Rather than looking down on reality TV, we should see it for what it is — a powerful tool to get our message heard by younger generations."
The politician said he has discussed his appearance on the jungle reality show with the part whips "in the same way any MP would when going on a foreign visit".
Watch: Matt Hancock stripped of Tory whip for entering I’m A Celebrity
His parliamentary whip has been suspended while he is taking part in the show, meaning he is not a member of the Conservative Party.
Hancock said he does not "expect to serve Government again" after being snubbed by new Prime Minister Rishi Sunak in his latest Cabinet.
He said: "As a backbench MP, I have the freedom and time to champion causes I believe in and care about - including dyslexia."
The former government minister - who was diagnosed with dyslexia at the age of 18 - is promoting his Dyslexia Screening and Teacher Training Bill to ensure no child leaves Primary education without being diagnosed with the learning difficulty which affects reading.
Hancock vowed to declare his I'm A Celebrity salary to Parliament and donate it to St Nicholas Hospice in Suffolk and causes supporting dyslexia.
The basic annual salary of a Member of Parliament (MP) in the House of Commons is £84,144.
Hancock is publishing a book in December entitled the Pandemic Diaries: The Inside Story of Britain's Battle Against COVID. Proceeds from sales will be donated to NHS charities and causes supporting dyslexia.
Among the other stars taking part this year are singer Boy George, former England rugby player and minor Royal Mike Tindall, who is married to the late Queen's granddaughter Zara Phillips.
I'm A Celebrity... Get Me Out Of Here! 2022 begins on Sunday 6 November and viewers can already vote for which celebrities they think should start out as Jungle VIPs by downloading the official app.