exorcising diet

dustbury says that jeff brokaw says that:

"We do not understand diet and nutrition and motivation well enough to make general policy about it."

the only thing i'm sure about my diet is that i've lost over 20 pounds mostly by cutting back on soda from 2-to-4-per-day to 1-to-2-per-week. i wonder how much more weight i could lose if i ever exercised...