Is cornflakes cereal healthy?

Cornflakes, assuming they are not coated in sugar, are not UNhealthy, but you can make a better choice for what you're trying to achieve. Cornflakes can be highly processed and lacking in fibre. If you find a more natural cornflake that has fibre and nuts you'll be getting more nutrition -- even something like "Total" has more nutrients than plain cornflakes. You really need to focus on three things when you cereal shop :

1) Sugar should not be in the first three ingredients


2) Fibre should be present


3) Whole grains should be present