Suppose that piece of cheesecake contained four hundred calories. Then I get eighty calories credit. Of course I am not sure that one-fifth is exactly the right figure. Any scientific theory is subject to revision based on new evidence. However, the official figure chosen at present for the Justice Diet is one-fifth, and I'm pretty sure that when all the evidence is in that it won't be far off.
Dieters have a tendency to deceive themselves about how much they eat.
Those on the Justice Diet must fight the tendency to deceive themselves about how much they pass up. I not only could have picked up eggs and bacon off the counter, but also a large stack of buttermilk pancakes, slathered with butter and dripping with maple syrup. But suppose that as a matter of fact I wasn't in the mood for pancakes, but was very much in the mood for eggs and bacon. Then it is fair to count the eggs and bacon, but it would be contrary to the Justice Diet principles to count the pancakes. One must be seriously tempted by the food in question for it to count.