One could assume that had he actually taken in all of the necessary calories for his day prior to eating this particular meal, that it would be just as 'anabolic' as any other given its content.
How would one possibly know how "anabolic" a meal really is? Who can prove that an anabolic meal must include protein? What if the protein content in the body was already sufficient at that time and no more protein could be assimilated? One would have to assume that a carbohydrate at this point, especially one with "complex" makeup, would actually spare the protein one had already eaten and maintain the positive nitrogen balance.
If one calorie above and beyond the positive caloric state of a body were consumed, where would it go? The answer would depend entirely upon the individual and how his/her body stored/used excess calories. Sure, one could hope that the extra calorie would be used to grow muscle, but the individual person would not consciously make that decision. That one calorie could indeed be stored as fat.
So, if the one excess calorie were used towards the growth of muscle tissue, could that one calorie in theory be described as "anabolic?"