San Francisco is so full of shit that it is looking at feeding the sidewalk poop to the homeless. The nutritional value of the crap in question is largely dependent on the age, health and level of activity of the person(s) it was harvested from. Because many of the San Francisco street poopers are older, sedentary and sick individuals, there should be quite a lot of unabsorbed nutrition left in there. Water, salts, sugars, carbohydrates, whatever else.