Joined: Jul 2002
Posts: 40,863
Likes: 3,115
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Neither stupid nor dangerous for most healthy riders. Google "fat adaptation rides". Several times a week I will go out for 90-120 min at tempo on nothing but a mug of black coffee. It's training your body to run on fat rather than sugar.