There are food insecure people all over the world. That is except perhaps in Antarctic. I would imagine that at scientific bases in Antarctic no one is worried about what to eat. Even if there is a disaster that cuts them off from resupply, surely there is a back up pantry that lasts a few months or more. What's the point of all this? It takes so much planning and preparation to live on the frozen continent that the crews who make the journey come prepared with enough food. That's what food security requires: so much planning and preparation.
When teaching farmers about food security in their household, we ask them to imagine they are planning a journey. What would they need to bring? Enough food or money to last them the entire length of the stay. Well, its the same when you are staying at home. You need to plan for each day, month, year so that you have enough food to get you through. You need enough for everyday life, and for emergencies. You need seeds to plant and replenish reserves before they are depleted.