unhealthy breakfast
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A cup of joe has loads of proven health benefits, but when paired with a fatty meal, it may be dangerous. New research published in the Journal of Nutrition found that when healthy people ate a meal high in saturated fat (something like eggs and sausage) and then drank two cups of coffee, their blood sugar shot up 65 percent in response to their next meal, hours later. "The levels were high enough for our healthy subjects to be classified as prediabetic," says study author Marie-Soleil Beaudoin. Apparently, the combo of saturated fat and caffeine has a lasting effect on how well your body metabolizes sugar, and renders your cells less able to use it for energy. As a result, you feel tired. Plus, chronic high blood sugar can lead to blood-vessel damage, belly fat, and type 2 diabetes. If you have a family history of diabetes, have your morning coffee with a high-fiber, low-fat meal, like cereal with skim milk — or switch to decaf when indulging in something rich.

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