The win, which puts Hamilton 39 points clear of competitor Valtteri Bottas who came second in the race, follows changes in Formula 1's driver weight rules which allowed the star to 'bulk up'.
'Healthier and happier' than ever
Earlier this year, Hamilton announced he gained 15lb, going from 68kg (150lb) - a weight he has had to maintain for the past 12 years - to 75kg (165lb).
"Adding weight was easy and I did this on a vegan diet. People say 'oh I need my protein and that's why I could never go vegan'," he wrote on Instagram.
"I have plenty of protein in my diet and I've gained muscle, and I'm healthier and happier than I've ever been. Wish I did it sooner."
'I choose to love'
The world-class athlete has often spoken out about animal-rights, blasting the meat industry for 'animal torture' last year.
In a series of Instagram stories, Hamilton said: "Animals possess values of which very few humans do... We turn a blind eye to the pain and torture we put animals through.
"Every bit of meat, chicken, or fish you eat, every bit of leather or fur you wear, has come from an animal that has been tortured, pulled away from their families and brutally killed.
"We all have choices to make and if you are ok with it, then that's you, but I choose to love, to be conscious of what I'm supporting and I refuse to support the companies that buy from those companies killing and torturing animals."
Hamilton joins the likes of plant-based tennis icon, Novak Djokovic, as one of the executive producers behind the vegan documentary The Game Changers.
"The Game Changers is a new film executive produced by James Cameron, Arnold Schwarzenegger, and Jackie Chan that documents the explosive rise of plant-based eating in professional sports, mixing real-time, groundbreaking science with cinematic stories of struggle and triumph," says the film's description.