"medium bowl" is not a standard measurement. My everyday bowls at home probably hold about 2.5 cups if filled to the top, which I don't do, because a bowl filled to the top inevitably spills. I use a 2-cup measuring cup every day, so I'm reasonably familiar with how much it holds. It's a decent bit.
Also, a cup of Cheerios is 100 Calories. So 3 cups is still only 300 calories. Add milk and you're at maybe 500 Calories. Even Honey Smacks is only 133 Calories per cup. If you eat 600 Calories of Honey Smacks and milk, I hope you'd consider that enough sugar for breakfast. Or else I hope you're training for a marathon.
Also, a cup of Cheerios is 100 Calories. So 3 cups is still only 300 calories. Add milk and you're at maybe 500 Calories. Even Honey Smacks is only 133 Calories per cup. If you eat 600 Calories of Honey Smacks and milk, I hope you'd consider that enough sugar for breakfast. Or else I hope you're training for a marathon.