Evaluate the breakfast recipes of the following three students from the perspective of balanced diet, and see which student's breakfast best meets the nutritional needs? Explain why and try to mention it A's breakfast lacks protein and vitamins; B's breakfast contains protein, fat, water, minerals and vitamins, but it lacks sugar, the main energy source. C's breakfast contains sugar, protein, fat, vitamins, water and minerals, and C's nutrition is comprehensive and moderate. Suggestion A: Remove a pineapple bag, add an egg and replace Fanta with carrot juice. Suggest B add a breakfast bread and half an apple.

So the answer is: A's breakfast lacks protein and vitamins; B's breakfast contains protein, fat, water, minerals and vitamins, but it lacks sugar, the main energy source. C's breakfast contains sugar, protein, fat, vitamins, water and minerals, and C's nutrition is comprehensive and moderate. Suggestion A: Remove a pineapple bag, add an egg and replace Fanta with carrot juice. Suggest B add a breakfast bread and half an apple.