The Bulletproof Diet is everything wrong with eating in America

 https://www.vox.com/2014/12/19/7416939/bulletproof-coffee

 Still, Asprey went so far as to say: "There is one best way to help people lose weight, and that is eliminating inflammation." He said people who want to lose weight just need to test out different foods, determine if they cause them to  "feel food cravings and brain fog" and then eliminate those foods from their lives.

To find out about the evidence behind this system, I looked at a bunch of the citations for the claims that he makes about food. What I found was a patchwork of cherry-picked research and bad studies or articles that aren't relevant to humans. He selectively reported on studies that backed up his arguments, and ignored the science that contradicted them. Many of the studies weren't done in humans but in rats and mice. Early studies on animals, especially on something as complex as nutrition, should never be extrapolated to humans. Asprey glorifies coconut oil and demonizes olive oil, ignoring the wealth of randomized trials(the highest quality of evidence) that have demonstrated olive oil is beneficial for health. Some of the research he cites was done on very specific sub-populations, such as diabetics, or on very small groups of people. These findings wouldn't be generalizable to the rest of us.