Caffeine is one of the most commonly consumed stimulants in the world.
But there are times when we don't even know we're putting it in our system.
Caffeine can be found in lots of foods, not just coffee and soda.
It only takes about 300 milligrams of caffeine to increase your risk of nausea, vomiting, nervousness and anxiety.
The Food & Drug Administration requires caffeine to be included in the listing of ingredients on food labels. But if it's naturally present in the product, it does not need to be listed as an ingredient. And therein lies the problem.
"Caffeine on our labels in the United States are not as clear-cut as things like saturated fats, or sugars, or fiber. Those are things we have in our labels that we can trace back to the ingredients," explains Kristin Kirkpatrick, M.S., R.D., L.D., the manager of Wellness Nutrition Services at the Cleveland Clinic Wellness Institute.
Kirkpatrick says your best bet when it comes to caffeine is to just listen to your body.
She says a couple of cups of coffee in the morning may be fine for some people, but with others it might not sit well.
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