It's all about the telomeres
Scientists studying the relationship of telomeres to cancer made a surprising discovery: a cellular recycling process called autophagy -- generally thought of as a survival mechanism -- actually promotes the death of cells, thereby preventing cancer initiation.
www.sciencedaily.com
If youre on eating twice a day.. say about 11am to take advantage of extending the sleeping fast...then ensure that the 11am grub is wet type food..grapes, yoghurt, berries, grapefruit. You want your metabolism woken to spit out yesterdays intake...else you are food stacking.
Forget half 7 feeds, sack it dont let anything dictate..sort out sleep/restoration till youre hitting its third stage...that will sort tiredness and then 5 straight days with nish nosh to eat will be well doable.