Hi, here is what I think it is saying:
Every 72 hours your body readjusts it's metabolic rate based on how much much you eat.
Every 48 hours it checks out how much working out you have been doing.
The reason you hit a plateau, is because your body has accurately figured out how many calories you are eating, how many calories you are burning, and what your metabolism speed should be at in order to maintain your weight.
Have you heard about starvation mode before? This happens when you eat too few calories. Your body senses you aren't getting enough calories, so it lowers your metabolism - that way you don't burn as many calories doing your normal daily routine. This is your body attempting to conserve calories.
So my guess at interpreting what you wrote is this:
Out of every 72 hours have one day where you eat more calories than the other two. This way - when your body reviews your calorie intake, to compare to your daily exercise routine, it will imagine you are taking in more calories than you normally do. If you only take in 1500 cals a day, but normally burn 500 then your body will try to adjust. But if you eat more one day, it will think your overall calorie consumption is higher daily, than it really is.
At least that's my guess...