When I go hiking for long periods of time, I make sure to include lots of nuts in my pack. Pecans and peanuts are staples, but macadamia nuts are best of all:

When I go hiking for long periods of time, I make sure to include lots of nuts in my pack. Pecans and peanuts are staples, but macadamia nuts are best of all: They're the most calorie-dense food on the planet, at about 720 calories per 100g. Peanut Butter Twix -- the apotheosis of ultra-processed calorie-dense junk food -- isn't even close, at 536 calories per 100g. One can easily gain lots of weight by eating too many nuts -- and it takes fewer of 'em than one might think.