Sugarless Kellogs with whole milk are super healthy and also very tasty. Unfortunatelt people end up eating junk such as frosty flakes with some milk substitute.
Sugarless Kelloggs don’t exist. Bare raw Corn Flakes are 8.4g of sugar per 100g. (Still better than “nature yoghurt” with 11g per 100g, knowing that a yoghurt is 125g).
1: different types of sugar
2: Apple would usually have much more raw fiber content = feel fuller for longer
3: because of first 2, it can be satisfying to eat a decent sized Apple for breakfast, with some water or coffee, but you'd have to otherwise have a whole bowl of cereal
Sugars are bad in that we only need so much of them and our brains are hardwired to be addicted to them/want more. Sugars from fruits are absorbed much more slowly than refined sugar.
Fats, sugars etc aren't inherently bad, there are healthy fats. But the main learning today is really that it's more about caloric intake (energy in, energy out) and it's easier to manage when fats/sugars & other carbs are delivered with foods that digest slowly/have a low GI - making us feel full for longer; it's better that our blood sugar experiences a constant slow release than spikes.
The problem is when we refine sugars & fats down and sprinkle them over _everything_ because "it tastes good". I can't believe American bread often contains a buttload of sugar. It's bread, not brioche!
Just use these cereal that say "Contents: corn" with no sugar. I believe that some Kellog's qualified, but that could be some time ago. Bingo: They will have some sugars, but these are natural corn sugars which would absorbed slowly.
Milk also contains slow-ish sugars, not refined sugar.
The problem here is Kelloggs is a brand from the era in which western nutritional diseases exploded and it's products reflect that. Corn flakes without added sugar are made by others and are like 3% carbs.