I was thinking of doing a very random IF. I wanted to roll a dice everyday to determine if it was going to be a feast or famine day the next day. Say if I roll a 1, 3, 5 its a feast day (eat normally, or at least a lunch and big dinner). 2, 4, 6 is famine (fast).
The big problem I forsee would be having to many of one day in a row. One thing I thought of would be to roll again on fast days with evens allowing me to 'find a berry bush' during the day. Or maybe just allow myself to have pemmican during the day.