In a roundabout way, yes. CR stands for Caloric Restriction, not "diet".
Therefore CR means any regimen (diet, if you prefer) whereby calories are
restricted. CR in and of itself does not define how much restriction, how sudden, age
of onset, frequency of eating, or macro/micro nutrient composition. The "ON"
portion of CRON, standing for Optimal Nutrition, is a matter of ongoing debate.
So yes, technically speaking, those eating either Atkins or Ornish, but
consuming fewer calories than "normal", would be both be in a state of CR.

Furthermore, recent studies by Mattson and others are showing equal or better
benefits to subjects on intermittent fasting regimens as those on traditional
CR regimens. In this case, those fasting EOD did not even lose any weight!
This brings up entirely new possibilities for ways of practicing CR, without
total calorie reduction. Thus new definitions are arising for the practice of CR,
revolving around meal frequency, and not just total calorie consumption.

Maddy Mason
Hudson Valley, NY

In a message dated 2/25/2004 12:44:29 PM Eastern Standard Time, Wade  writes:
If you are defining CR as any
'diet' where
you lose weight, that will equate approaches like Ornish and Atkins.