For me, given my naturally intense disliking of all plant-foods, it has been incredibly effortless. However, like most of us here, I’ve been low-carbing for about three years. My body has already more or less acclimated to burning primarily fat.

So far, being on 0 (5 in practice) carbs hasn’t caused any issues thus far. Even my weight workout sessions haven’t really suffered. I feel great, and feel that I’m now as physically more fit and healthier than I have ever been at any other point in my life.

In my case, I am certain it is from eating a purely fatty meat based diet.