Don't skip breakfast!

When you wake up after a long night's rest, your body has gone as much as 12 hours without a meal. That means one thing: You need fuel. More precisely, it means there's probably a shortage of glucose in your bloodstream. If you don't eat breakfast and head out the door with low blood sugar, one organ in particular won't be operating at full speed: your brain, which requires a steady flow of blood sugar to run effectively. And even a mild case of low blood sugar can leave you queasy and jittery. You may also feel less sharp-witted. Studies of school children have shown repeatedly that kids who eat breakfast have better memories and learn more than their classmates who don't.

What's more, blowing off breakfast is a set-up for pigging out later on. "Breakfast is important for keeping your appetite under control the rest of the day," says endocrinologist Suma Dronavalli, MD, of the University of Chicago Medical Center. In other words, skip breakfast and by noontime your groaning stomach will convince you to skip the salad and order a Dagwood-size sandwich, instead. Most people more than compensate for the calories they miss at breakfast by overeating at lunch and dinner - especially foods high in saturated fat, the kind that plugs arteries.

Meanwhile, breakfast skippers are also more likely to snack on junk food between meals. One study found that women who usually nixed breakfast were able to take off four pounds - simply by adding a nutritious meal in the morning. Eat breakfast regularly and you'll not only lose weight, but your blood sugar should shape up, too.

More than three quarters of people who lose weight and keep it off eat breakfast. Sitting down for the morning meal may also make you up to 50 percent less likely to develop insulin resistance, the problem that causes type 2 diabetes.