From the consumer perspective, calorie needs are stable and predictable, fundamentally different from what insurance is for.
From the supply chain’s perspective, there is a very sophisticated insurance system to smooth out issues with crop yields, weather, etc. called the commodity futures market.
Both of your points are true of healthcare. No, not everyone will break a leg or need major surgery, but everyone gets old and dies. Flu shots come out at the same time as pumpkin spice lattes. From an aggregate standpoint I would wager healthcare needs and costs are predictable and forecastable, just like commodities.
From the supply chain’s perspective, there is a very sophisticated insurance system to smooth out issues with crop yields, weather, etc. called the commodity futures market.