Most FB coaches, especially former players usually have BMI's in the overweight to obese range, . Granted he's still young, but visibly he's mostly lean muscle. Plus IF is such a bay area thing.
https://www.sfgate.com/technology/businessinsider/article/A-Facebook-executive-says-fasting-for-15-hours-a-10780431.php#photo-15311615
https://www.sfgate.com/technology/businessinsider/article/A-Facebook-executive-says-fasting-for-15-hours-a-10780431.php#photo-15311615