The Latest Craze id adding gobs of Butter and Oil to your Coffee. Popular with High Fat, Low carb Keto diet. The Butter and Oil trend started a few years ago with the Launch of Bulletproof coffee.Silicon Valley Entrepreneur Dave Asprey founded the Company after being served tea made with Yak butter during a hike in Tibet. People who drink this coffee for breakfast don't care for food until Lunch. Who is drinking Coffee with Butter,Coconut oil or MCT Oil (medium chain triglycerides) ? Can you share any knowledge or results.