L-beta-hydroxybutyrate is metabolized like a fatty acid into acetyl-CoA, while D-beta-hydroxybutyrate undergoes a redox shift causing a reductive shift or stress.

“It does not. >> So no V told me that and I'm a believer that the L because it gets metabolized much slower. >> Right. But if you just take the total metabolism of it, are you saying one mole of one and one mole of the other produce a different amount of ATP? Yeah, they will ultimately L beta hydroxybutyrate will go into acetal COA but it'll be metabolized more like a fatty acid. So where the D gets uh the D has a redox shift and it causes a reductive shift. Actually you could have reductive stress. I'm going to come to that in a minute. But you have the D and the L. They get metabolized at different rates.”