I have no idea. It just seems odd to me that assuming a relatively low protein/fat intake is easily done then why have a metabolic pathway for it? My guess it's

I have no idea. It just seems odd to me that assuming a relatively low protein/fat intake is easily done then why have a metabolic pathway for it? My guess it's to work with fat stores over long periods of starvation (get fat in Spring/Summer/Autumn, 'starve' in winter).