Lab grown meat and salmon seems to be on a good track right now, but still a bit far off for widespread adaption and low cost, until then i guess either a slow controled population decrease (this sounds like killing, this is not what i mean), controlling the obesity crisis by regulating junk food producers which purposefully produce addictive food, focus on a plant based diet, less overconsumption, reducing food waste by throwing less stuff away, abolishing a best before date. Just some (not perfect) examples from the top of my head.