Another short story from some 1970-80s anthology.
A scientist is involved in an explosion at a reactor or collider facility. There's a lot of distruction but he is pulled out of the ruins alive.
Doctors treat his injuries, but medications are less successful. Over a few days the man's appetite returns but it seems that the food they give him isn't doing him any good and he begins to look starved.
After examining some wreckage, scientists eventually realise that it has been reversed at an atomic level. This also true of the survivor. Wrong-handed molecules of food can no longer nourish him.
Creating enough opposite to normal food molecules is obviously impractical. The only solution to prevent him from starving to death is to re-stage the incident and hope he is re-reversed back to normal.
I can't remember what the outcome of this was.