“An Australian study tells us that modern day hunter gatherers get 64% of their energy from things that move, 36% from plants, basically two thirds flesh, one third non-flesh. The creatures we eat are usually nutritionally dense. This does not hold true for plants.
While plants can provide important minerals, vitamins, antioxidants and necessary trace elements most of them don’t pack a caloric punch. Many if not most plants take more energy to collect, prepare and consume than we get back in calories.
Dandelion greens could be a classic example.
We have to find the dandelion greens, pick them, clean them, and in a true survival situation find the fuel to cook them, something to cook them in and good water to cook them in. That takes a lot of energy and time. For that dandelion leaves offer us little, and while the root is edible it is quite bitter…”