4 Bad Habits That Can Ruin Your Health

Habits are things we do frequently, so they potentially can affect our health. Do you have any of these four habits that could be making you sick?

What happens when you don't sleep enough, skip breakfast, don't exercise, or hold grudges? Find out how these behaviors are harming your health.

What happens when I only sleep five hours?

The inside story: No one knows for sure why sleep is necessary, but there's no doubt that getting too little throws a wrench into your body's works. For example, studies show that a sleep debt lowers levels of the hormone leptin, which helps keep your appetite under control. Implication: Sleep too little, and there's a good chance you'll be soon overeating. Sleep deprivation also boosts levels of stress hormones, which prompt your body to send more glucose into your bloodstream. Too little sleep also makes your body less sensitive to insulin.

But that's just the beginning. Research shows that sleeping too little shuts down production of certain chemicals in the immune system that defend your body against germs. Shortchange yourself on shut-eye and you may want to have a box of tissues and cough medicine handy: A 2009 study found that people who sleep less than seven hours a night are up to three times more likely to develop a cold. Read more