Pro-oxidant stimuli such as sunlight, exercise, cold, heat, fasting, and ketosis can trigger adaptive responses in the body similar to those induced by phytochemicals.

“so if you just give your body a little bit of a pulse right if you give your body some sort of a pro-oxidant whether it's you know sunlight or exercise or cold or hot your body will do the same thing it'll turn on the same pathways even fasting will do it ketosis will do it skipping a meal and overnight fast”