Very good coverage Christian. Also interesting with the Spud guy & the other gardening guy. The McDougall Plan was potato heavy diet.
I could have expanded it to include the other food groups, but my main intent was for showing the calorie burn for average daily requirements & amount of calories able to be grown. Otherwise, post would have been a mile long. But I know you understood what was meant.
Short term survival in a no food situation.
A lot of people believe they will just fast when food is scarce. The human body does not work like that, and is because of the body's lost (FBM) Fat Burning Metabolism (see PDF Zone) due to the dietary way of life so common in the modern era of grocery stores. Also, the sugar, dairy & grain industry which is primarily fast metabolized carbohydrates, all contributing to the lost FBM.
Your mention of needing to have the body running optimally. It cannot be done without having or recreating a healthy FBM.
I did that post on FBM, in hopes of showing people how easy the plan is to regenerate a healthy metabolism to include both types of calorie burning metabolisms, Carbs & Fats. Actually doing it is much harder, taking up to 3 or 4 months of daily morning exercise while in an overnight fasting state. It is not hard exercise, can be done at slower paces. There is a turning point and when the body reaches the true FBM well tuned metabolic state, the person will know it and will have energy to spare without hitting that wall, a total opposite to a carb metabolism.
It is not that hard to do.
In my food supplies, I have a good many large jars of Coconut Oil, a food not many survivalists would recognize as food. I plan on Seal A Meal in smaller packets of 8 ounces or so & label as grease.
Food marauders would likely be after the obvious, high starch & sugared foods, meats etc.