Yeah, that's one comment on Zion even before he went to the NBA, weight issues, and now that he is injured and not playing, he has ballooned so much that he doesn't look fit at this point.
That's why his detractors says that he should hire dietitian to help him out control his weight otherwise if will be very difficult for him to comeback if he is going on see-saw diet, not going to be healthy in the long run for him.
The weight was already there, but look how effective he is during the last season and every time he is on the court. Maybe his weight made him injury prone and I'm pretty sure the management and staff would do everything to protect their investment.
Many doubt about him due to that matters so if Zion want to stay on the league for long time then maybe he should manage this issues and find some ways to lose some weights. But for sure his management will advice that to Zion since he will lose his star status if he will became injury prone at early stage of his career.
If he plans on losing weight, then probably he already did that in the very start of his season. I guess he is the Shaq of NBA and he will never change, he just have to be very careful and trust his teammates to also deliver so the pressure for him to score is not so high.