Comment by thaumasiotes

I can't really tell what you were thinking here.

Oatmeal is nutritionally identical to cereal for the obvious reason that that's what it is.

Here's the nutrition sidebar for Quaker Oats rolled oats versus Cheerios:

                   +---------+----------+
                   | Oatmeal | Cheerios |
    +--------------+---------+----------+
    | Serving size |    40g  |      39g |
    +--------------+---------+----------+
    |     Calories |    150  |      140 |
    +--------------+---------+----------+
    |          Fat |     3g  |     2.5g |
    +--------------+---------+----------+
    | Carbohydrate |    27g  |      29g |
    +--------------+---------+----------+
    |     (sugar)  |     1g  |       2g |
    +--------------+---------+----------+
    |     (fiber)  |     4g  |       4g |
    +--------------+---------+----------+
    |      Protein |     5g  |       5g |
    +--------------+---------+----------+