Can one cup of coffee help you lose weight and make you smarter? Bulletproof Coffee is made with unsalted grass-fed butter and extract of coconut oil. It's the brainchild of entrepreneur Dave Asprey. He says one cup will give you six hours of sustained energy. "The No. 1 benefit of Bulletproof Coffee is this mental clarity and lack of cravings that comes because it puts you in a mild fat burning state as if you were on a special diet even though you're not," he told Inside Edition.