Perks such as making all zombies move in a slow motion or temporary are literal life savers in dire situations. (jamiex66.com)
They might even be literal life savers, if you get as hangry as I do. (willcookforfriends.com)
Glycogen storage disease (GSD) and glucose transporter 1 (GLUT1) deficiency syndrome are two other conditions for which a ketogenic diet is a literal life saver. (nutritionmayhem.com)