Alok ji,
Food charges are pre included in train fare in Duranto, Shatabdi and Rajdhani trains. whether or not you avail the facilty is optional, but you can not claim any refund on this account. It is not a question of rich or poor. Rich people also travel in other trains and they can not ask for inclusion of food charges in their train fare. These rules as framed by the railways for the benefit of passengers are applicable on all classes of people both rich and poor. No deviation is allowed.
Regards.