Low and moderate gamers looked basically the same in terms of diet, sleep, and body weight. The real drop-off happened once gaming crossed the 10-hour mark.

Students in the high-gaming group had poorer diet quality, higher body mass indexes, and worse sleep. Their median BMI landed at 26.3, edging into overweight territory, compared to much healthier averages of 22.2 and 22.8 among low and moderate gamers.

Tl;dr: 10+ hours / week seems to be the threshold