A fitness expert has slammed Logan Paul and KSI's Prime energy drink and called it their “most profitable scam yet”. James Smith looked at the science behind hydration and claimed that despite the fact the drink is the official hydration sponsor of UFC, Bayern Munich, Arsenal and Barcelona, Paul and KSI “don’t even understand” the concept of hydration. Explaining how rehydration works, Smith said that water and sodium are key to tackling dehydration. He said: “If you’re partaking in a sport [where you] lose loads of water and loads of salt [and you] replenish with just water, over time you’re going to create a negative balance of sodium.” While Smith explained that replenishing electrolytes sodium, potassium, calcium, and magnesium, it was sodium that is the most important to replenish. He then compared Prime’s offering to other leading brands, showing that Prime only has 5mg of sodium. It did however have an impressive 700mg of potassium. Logan Paul's Most Profitable Scam Yet www.youtube.com Powerade, meanwhile, contains 168mg of sodium and 200mg of potassium. “So understanding that when we sweat we lose mostly water and salt, which one of these two, [Prime of Powerade], do you think is going to be superior when it comes to replenishing the sodium that you’re losing?” he asked. It comes after Paul and KSI’s Prime defended the levels of caffeine in its beverages after facing a backlash. Health experts previously called on the US Food and Drug Administration to investigate the energy drink company. A 12 oz can of Prime, which was founded by YouTube stars Logan Paul and KSI, contains 200mg of caffeine, equivalent to about half a dozen Coke cans or nearly two Red Bulls. Sign up to our free Indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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John Fury stole the show during Tommy Fury and KSI's press conference ahead of their fight this weekend, when the former boxer sensationally tried to attack the YouTuber through perspex glass. Fury and KSI were facing off in a cage with only the transparent sheet between them, when the 24-year-old's dad appeared to lose his temper and began punching and headbutting the glass. KSI appeared unphased by it all, encouraging the people holding him back to 'let him'. Sign up to our free Indy100 weekly newsletter

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Humblebrag incoming: I’ve always considered myself to have a sharp mind. I can think on my toes, have no trouble getting tasks done, and can often put two and two together before the next person even realizes there’s two to begin with. But recently, that hasn’t been the case. For almost a year now, brain fog has taken over my life, and my mind hasn’t been up to par with the alertness of my past. Brains need to be kept healthy — just like any other part of our body — to be able to do their jobs, and do them well. So what’s wrong with mine?