Popsugar Health & Fitness Weight Loss Basics of Keto Diet The Holy Grail Keto Diet Guide — Everything From the Surprising Benefits to Weird Side Effects 25 August 2018 by Tamara Pridgett View On One Page Photo 2 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 The Cons of the Keto Diet While the keto diet is great, you may experience a few of these unpleasant side effects. Keto breath Keto flu It may increase cholesterol levels Vitamin and mineral deficiencies Dehydration Previous Next Start Slideshow Keto DietDiet TipsLow-CarbWeight Loss