Nearly 80 million people already have pre-diabetes and most don't know it. Pre-diabetes is when your blood glucose levels are higher than normal, but not high enough for a diabetes diagnosis. At this stage, the condition is still reversible.

Here are some red flags to watch out for:

Number one, feeling beat when you eat. If you're often drowsy after dining, it could mean your diet is too high in simple carbohydrates, like sugar and sweet drinks.

So eat more complex carbs like whole wheat, veggies and fruit. The body works harder to break them down, which helps stabilize blood sugar levels.

Next, if you're overweight and cutting calories isn't cutting the pounds, beware - it could be a sign your body's becoming insulin resistant.

Instead of trying to shed a lot of weight at once, try a little at a time. Just losing 10 to 15 pounds can make a big difference.

Finally, are you an apple or a pear? Being pear shaped is not a big pre-diabetes risk factor, but if you look more like an apple, you could have it.

Men with waistlines of 40 inches or more are at risk. So are women with waistlines of 35 inches or more.

If you're over age 45 and overweight, you should be tested for pre-diabetes at your next routine check-up.

Doctors may recommend earlier screenings for patients with other risk factors such as high blood pressure or family history of type -2 diabetes

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