Silicon Valley techies like to drink buttered coffee.

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Tech people in Silicon Valley and San Francisco have recently become popular to drink butter coffee. They believe that the addition of butter fat to coffee helps boost people's spirits and therefore productivity.

Taking advantage of this trend, retailer Pic Nik launched three bottled buttered coffees in August, which are sold in more than 400 "Whole Foods" stores across the United States. The price is 4.99 yuan per bottle.

Naomi Seifter, the founder and CEO of Pic Nik, began experimenting with buttered coffee in 2013, which was definitely a brand new flavor and was given away for free at first to attract consumers.

"I know it's weird with butter and coffee, but I tried it anyway," she said. " Now, this kind of coffee is weird and has become the trend of technological people.

Pic Nik's three kinds of butter coffee are: mocha latte (Mocha Latte), cappuccino (Cappuccino) and tea butter coffee (Dirty Chai).

How do they taste? The cappuccino is light and tasteless, and the sugar is only one gram.

The mocha latte tastes good, but with maple syrup, there are 21 grams of sugar, so much sugar, many people are deterred.

But tech people in Silicon Valley and San Francisco like buttered coffee, thinking that the fat of butter can increase people's energy, while others think it helps to lose weight. However, according to experts, there is no scientific basis for this fat-increasing diet.