A little treat is of course a fine thing for anyone, even or especially a child. But an excess of junk food available during the school year can not help and can only hurt their performance and attitudes. It affects the brain badly and it makes them slow to learn. It also contributes to obesity, and we need balanced young people.
No, eating junk food does not help students, because it takes away their concentration. A health diet including grains, fruits, and vegetables, is best for students to study, because proper nourishment makes their mind and body strong. Eating junk food causes distractions, and it prevents students from being their best to learn.