Eating a big solid breakfast helps you lose weight because it is simply the most important meal of the day. After a full night’s rest, your body and mind demands to be recharged. Otherwise, it will start stripping energy from your muscles (thus destroying muscle tissue).
You will also experience less hunger throughout the day, and a decreased craving for snacks.
After an 8 month study, the group that ate a big breakfast had more energy, became more active and lost weight.
http://www.cnn.com/2008/HEALTH/dailydose/11/19/big.breakfast/index.html