The 57-year-old actor, who has been dealing with high blood pressure since the age of 36, recently revealed he has been diagnosed with Type 2 diabetes, a lifelong condition which occurs when the body does not produce enough insulin, reported BBC news.
The Oscar winning actor had to lose weight for his roles in "Philadelphia", "Castaway" and "Forrest Gump".
"I've talked to a number of actors who have gained weight for roles and - just out of the sheer physical toll on one's knees and shoulders - no one wants to do it again," Hanks said.
But the actor thinks that he may have got the disease genetically.
"But I think I was genetically inclined to get it. I think it actually goes back to a lifestyle I've been leading ever since I was 7 years old, as opposed to 36. Pizza is the most delightful thing ever invented, and it's - for me - diabolically dangerous," he said.