Dietitians are offering a word of warning when it comes to 'bulletproof' coffee.
The current diet trend is a blend of butter and coconut oil in your cup of joe.
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No danger in drinking 4-5 cups of coffee per day.
Supporters say this high-fat coffee is an energy boost.
But dietitians warn you're taking that coffee from 0 calories to almost 500.
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Instead, they recommend balancing your java with fresh fruits or oatmeal for a similar energy kick.