Most of us would rather buy a used car from the little old lady down the street than the 24-year-old drag racing dude from around the corner. Why? Because we know that the drag racer has been slamming his foot on the accelerator every chance he gets... and the little old lady? She has been using her car with great care. So her car will last longer.
When you wake each morning and consume a carb-heavy breakfast, low in protein and fat, YOU are that dude slamming your foot on the accelerator. Your blood is quickly flooded with the glucose from the sugar and starch in your fruit, breakfast cereal, and skim milk (or your oversized bagel, low-fat cream cheese, and orange juice), so your pancreas scrambles to pump out insulin to keep you from slipping into a hyperglycemic haze. Your blood sugar spikes, your insulin levels spike, and you begin a roller coaster of a day, slamming on the accelerator and the brake from a blood sugar perspective. This is not easy on your body - your pancreas, your tissues, your teeth - high blood sugar and high insulin levels are just not good for any part of you.
Look here for a graph of blood sugar levels after two very different breakfasts... eggs vs. cereal.
Take it easy on your body. It is your home. Use it gently. Eat real food. Eat more fat.