Six nutrients needed by human body: protein, sugar, oil, vitamins, inorganic salts and water; Combined with the meaning of the question, the main component of rice is sugar, and braised fish and spicy tofu contain oil, protein and inorganic salts, indicating that the vitamin content in food is less; Therefore, in order to make the nutritional collocation more reasonable, it is necessary to supplement foods rich in vitamins.

So the answer is: (1) vegetables (the specific name of vegetables can also be answered).

(2) lack of vitamins and other nutrients in the recipe (just in line with the meaning of the question)