Smart shopping
Not exactly sure what this implies. I buy edgy food which was slow to move off the shelf so the price gets cut down in order to make it move. It’s cheap¹ and mitigates food waste outside my house. If by smart shopping you mean to buy the freshest food, well then that would prioritise nutrition over rescuing local food from waste. Which is smart is not obvious to me.
My kitchen becomes like a ER triage to eat food before it spoils. And sometimes I have to do surgery and make sculptures. That is, carving decayed parts out of partially ruined food. It’s food in its least nutritional state, but there is still something to be said for training your immune system.
Ex. I eat leftovers from last night’s dinner for lunch the next day.
Leftovers the next day risks giving you more of the same nutrition you still have traversing your body from the previous meal. So I deliberately skip a day or two on leftovers to ensure the nutrients are replenished when they are needed more (which is after they left the system). Leftovers are also less urgent because the cooking kills the baddies and enables the spoilage clock to be reset.
¹ Since the edgy food is generally ½-off, it’s fair to say I can buy twice as much for the same price. I don’t really know if that more or less than compensates for the age-induced decline of vitamins.