For normal fasting Sahar food is necessary are not? 
He is based on the following message that you need to feed your brother in Sahar.

Prophet Muhammad (pbuh) came to me one day: "You (EAT) is there?" He asked. We have no "may. "Then I (today) will be fasting," they said. After another day, when they came to us, "O Messenger of Allah! Our "knee highs' were gifted to the dish" may. They said, "Show it to me. I taken fastinb this morning, "he told me and it (bought) Die eat. Narrated : Aisha (RA ) , Muslim 2125

If you eat foods anything extra in the morning of the day even after the fasting taken that are authorized to decide on the evidence is that the above hadith.
Prophet Muhammad (pbuh) is in excess of daylight, they decided to take fasting. After sunrise, because the sun does not make provisions for Sahar Fasting taken is not clear from where.

If you do not have opportunity to take fasting, this news suggests that it is not wrong. Please have the opportunity to take Sahar, do Sahar then take fasting, its is way of Prophets. This is clear from the following messages.

The Prophet said, "Take Suhur as there is a blessing in it."  
(Narrated : Anas bin Malik, Buhari 1923)