Hrmph

To follow-up on yesterday's post -- I went out to dinner with colleagues instead of working out last night, and then failed to get up this morning to go for a run.  I don't know what's wrong with me!!  I understand the equation (Diet+Exercise=Skinny), so why oh why do I let the evil morning demon prevail?  This is not a rhetorical question -- I really don't know the answer.