Absolutely. I would eat the lettuce and celery for water content and digestion and the tubers and roots for energy. I don't need science for that one but the seasons vary on this one. I just wonder which greens were available with which roots and tubers. The roots and tubers had a much longer shelf life too. Oliva ----- Original Message ----- From: "Todd Moody" <[log in to unmask]> you > get more energy from a sweet potato than from a bunch of lettuce. they would favor denser foods, > which would include tubers, roots, and similar concentrated > plant energy sources.