>Maybe the issue with society is that we don't care about efficiency?
>We throw away 1/3 of the food that we make. We're overweight and waste energy from carrying that excess weight.
Throwing away food can be efficient. In fact, absent evidence to the contrary, we should expect that throwing away food (or buying/producing more) is the more efficient option out there, given that people aren't putting effort into conserving food. Remember, conservation isn't free. For instance it might be possible to reduce the amount of fruits that are bruised and thrown away, but that requires more packaging and more careful handling, which isn't free. At the household level, proper meal planning and inventory management can probably eliminate all food waste, but nobody wants to spend the mental effort into managing an ERP for their kitchen.
>We're less physically active as a result so we require motorized transport that is predominantly single passenger cars so we build all our infrastructure around cars which in turn causes us to be even more inactive and unhealthy.
You got cause and effect mixed up. People live in suburbs and drive around everywhere because they like the suburban lifestyle (eg. cheaper/bigger houses, "safer" and "quieter" neighborhoods), not because they're not too fat to live in 15 minute cities. Remember, suburbanization happened well before the obesity epidemic.