If I've fasted since an early evening meal and I skip breakfast (and I've done it for a week or two) I'm razor sharp until I eat. My mind feels significantly k

If I've fasted since an early evening meal and I skip breakfast (and I've done it for a week or two) I'm razor sharp until I eat. My mind feels significantly keener. In fact I used to dread eating something, anticipating what felt like a loss of 15 IQ points