A thousand-mile journey begins with the first step. Even a little helps.

With the obesity epidemic it is probably better to tell people they can just compost their food if there is too much and they can't eat it. And then cook a little less next time.

I keep 100% of foodstuff out of my trash, and an added benefit is that you never get stinky trash that needs to be taken out. I take my trash out every 2 weeks and it never smells at all.

My parents regularly throw out spare food (bread, meat, fruit) onto their lawn, local wildlife (birds, foxes, hedgehogs) always take it all within 24h.

Not much wilflife about it then.

I seperate my compostables as well. I don't even use a trash bag in my bin anymore. My trash bin fill up so slowly that I go months without taking it to the street.

My uneaten food went into the fridge for my next meal as a kid.

Sorry you had abusive parents

Eating leftovers is perfectly fine, and a hell of a lot less wasteful than dumping it in the compost.

IMO leftovers taste better than the original meal.

How do you deal with meat leftovers? You can compost plant remains but meat becomes another issue.

Find a neighbor with a carnivorous pet.

Alternatively, eat less (or no) meat; it's good for the environment: https://ourworldindata.org/food-choice-vs-eating-local

OTOH the 80/20 rule for optimization says to not waste effort on tiny inefficiencies.