I would agree that food is the least important physiologically, at least. .....
In cold weather, when hypothermia is an issue, I would argue that food can be rather important. Sugar and other simple carbs are best for a quick warm up.
+1 on food being an important part of the hypothermia arsenal. Also, a great way to stay warm on a cold night, is to eat a carb + fat snack or small meal before bed and stoke the internal furnace.
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