Heard of the 'Bulletproof Diet'? Harry Styles Does It! -- What You Need to Know

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The Bulletproof Diet was created by Silicon Valley executive Dave Asprey, who struggled with weight problems for decades. In the course of 15 years, he devised a new eating plan and changed his eating philosophy to address his weight and commit to a healthier lifestyle.

Asprey's weight loss efforts resulted in a 100-pound lost and he did it by "hacking" his body's biological makeup. He claimed that his system enabled him to improve his brain's IQ points by 20 and made his sleeping time more efficient, per the Bulletproof site. Thus, Asprey termed his diet plan "bulletproof" because he felt renewed like a superhero through it.

The Silicon Valley executive wrote "The Bulletproof Diet: Lose up to a Pound a Day, Reclaim Energy and Focus, Upgrade Your Life," which became a best seller in the New York Times. Soon, Asprey's weight loss plan attracted many followers including One Direction singer Harry Styles and "Divergent" actress Shailene Woodley, per The Huffington Post.  

The Bulletproof Diet mainly proposes reducing or completely doing away with the intake of alcohol, sugar, fructose, processed food and GMO, vegetable oils and grains. A person following the diet plan must also avoid eating a lot of vegetables in the "nightshade" family like garlic, tomato, artichoke and eggplant.

Extra virgin olive oil and protein from farm animals, even if they are grass-fed animals, are also bad. For Asprey, these contain "anti-nutrients" or toxins that make the body vulnerable to all sorts of illnesses and disease, per Red Orbit.

While these look similar to the Paleo diet, Bulletproof requires the drinking of the Bulletproof coffee for breakfast. It's supposed to give the body energy for most of the morning, without having to actually eat breakfast food. QZ reported that the coffee is not cheap, being a signature blend. It comes with an energy boosting butter and oil concoction that should be mixed with the drink.

Daily Mail reported that the coffee butter has 400 calories, per Joanna Della-Ragione, a Londoner who tried the diet. She lost two pounds during the first week but eventually concluded that the whole diet plan is "unsustainable."

"There are a lot of 'toxic' foods that Asprey recommends you steer clear of and many of them are close to unavoidable in everyday life," said Joanna. She quit Bulletproof because making the choices of what she can and cannot eat made her miserable. She also pointed out it's a diet that won't be afforded by many despite the benefits that Asprey's claims it delivers.

However, this video review of the diet plan talks of a different and better experience: