Anyone familiar with the research of Prof Michael Ristow? He noted that the increased lifespan of a worm, Caenorhabditis elegans, when subjected to calorific restriction, is attributed to induced oxidative stress. This (hometic) stimulus causes the organism to produce its own powerful antioxidants.
BUT - he also noted that administering antioxidants negated the increase in longevity - presumably by blocking the induction of oxidative stress.
One might be compelled to conclude that a diet rich in antioxidant may well be antagonistic in an IF regimen, or at least drinking teas containing antioxidants (eg green tea, rooibos etc) should be avoided during the fasting cycle.