Good for you..sensible thinking..I've never heard of 5:2..I wouldn't do that even if I knew what it was. I have learned and adapted a healthy way of eating and I stick to it. I eat pretty much the same things everyday. I get into trouble when I introduce unfamiliar foods into my staples. for meat its just chicken, turkey bacon, venison (I live in Minnesota..lol) turkey burger, ham, & deli ..quaker oatmeal, Quaker caramel corn flavored rice cakes, Smuckers natural peanut butter, applesause, lots of fruits and every vegetable I can get my hands on..lol..oh and green olives..lots and lots of spices.. I've been maintaining for 4 years. oh yeah, no bread, pasta, rice, dairy (surgery made me lactose) and absolutely no sugar. But its maintainable for me. I had to find it. it didn't find me, Im still looking for great foods..