Breakfast is the most important meal of the day and should never be avoided as it kick starts your metabolism and ‘breaks the fast’ from the night before.
You should eat and drink something within 30 minutes of waking. Skipping breakfast can slow your metabolism plus those who skip breakfast are so hungry by lunchtime, they make unhealthier choices and eat a larger quantity than they normally would, thus cancelling out the calories you cut by skipping breakfast.