Only for half of protein and carbohydrates that can go into the gluconeogenesis pathway. That'll increase uti incidence, shred your kidneys with proteinurea, and lead to ketoacidosis when you're dealing with the other half of the proteins and all the other lipids, which before it kills you will allow you to excrete that waste from you lungs while you smell like you've been huffing nail polish remover. I think the out the butt option is generally preferable.