However, a small advance of 6 × 11, known as the "Greek freak," revealed that he got 51 kilograms of muscle from a break in the NBA.
The 24-year-old helped Bucks win the TD Garden in Massachusetts, finishing the night with 30 points, eight rebounds, five assists and three blocks.
The victory extended the winning streak of Bucks in four games, which in turn led Celtics to succumb to the third consecutive defeat.
Bucks' advantage was insignificant during the third quarter, as Boston reduced the difference to one-digit.
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Jailen Brovn was led by Brovns with 21 points.
But every time the Celtics reduced the deficit, Milwaukee turned to Antetokounmp, Khris Middleton, or Tony Snell to keep them under control.
Bucks boost their record at 22-9 and remain in second place behind the Toronto Raptors East Conference Leader.
Bucks coach Mike Budenholzer admits the team relies on the superstar.
"We are here with Janis every day, every night," Budenholzer said.
"Whatever he does, whatever you call him, he plays for us in every situation and does everything."
Antetokounmpo's performances have an early favorite for the MVP Award for 2019.
As Antetokounmpo developed Middleton, his role in the attack on Bucks has changed significantly.
"Coming here, it was some new start and I had to make my place," Middleton said.
"So, at the time I am now, I still have this hungry way of thinking. I want to do great things, I still want to run a team, but at the same time you have to sacrifice certain parts of your game.
"Come on, shoot." Little by little, but I know it's best for the team, so I do not understand it at all. "
"I accepted that role, I accepted who I am as a player and a person."
Bucks are next in action on Saturday where they face a trip to play Miami Heat in Florida.