The body is the temple of the Holy Spirit. 1 Cor 6:19-20
Gluttony is sin. (Pro 23:20; 28:7). Being overweight is not.
We should not push our conscience on others regarding specific food choices. (Col 2:16; Rom 14:3; 1 Tim 4:1-4)
It is a profitable, virtuous thing to take care of one’s body. (1 Tim 4:8; Prov 31:17) However, it is difficult to define for ourselves or others what it means to be “fit.” It should be left to the individual conscience.
There are some video games – those in which we pretend to be persons engaging in sexual immorality, extreme violence, or criminal activity – that cannot be helpful to anyone spiritually. 1 Cor 6:12, 10:23
If there is a game I can play without my affections for the Lord being challenged or my biblical worldview being dismantled or my being called to celebrate ungodliness, I could enjoy that and be fine.
Anything can be damaging if it becomes an idol. 1 Cor 10:14; 1 John 5:21