The 41-year-old actor - who plays a giant in his new movie who is constantly stared at by little people - has found his celebrity status means he gets recognised everywhere, but he insists he likes the attention.
He said: "I don`t know that I feel like a giant but I am definitely aware that I have lost my anonymity. It`s an ego boost getting noticed. My ego is definitely a giant."
Jack - who has sons Sammy, four, and two-year-old Thomas with wife Tanya Haden - also revealed he lost weight while filming `Gulliver`s Travels` in London - because of the amount of stairs in British homes.
Jack - who usually lives in a lavish bungalow in Los Angeles -said in an interview with The Sun newspaper: "The houses here have a lot of floors.
"So I have got a lot of exercise. My boots are like powerful pistons.
"We are having a great time in Britain. They have great parks here, we have been exploring."
But the actor - who recently admitted his New Year`s resolution is to go on a diet and drop 50lbs - has discovered he loves a calorie-laden British curry.
Speaking about eating out in the UK capital, he added: "I love the food. I love the curries. They have better curries here. I am a sauce man by nature."