Fyer Keto Price : Finally, the diet's fat-heavy aspect can have negative health consequences if dieters load up on too many trans and saturated fats, something that Wallace says is easy to do. "People will go to McDonald's and get a triple cheeseburger, take the bun off, and eat that," he says.Cutting out low-quality carbs found in soft drinks and white bread, for instance, is a good idea for anyone, Ryskamp says. Sugar and starches raise the risk for obesity, diabetes and heart disease. After all, it’s a low-carb, high-fat diet rich in meats, eggs, nuts and dairy. Fruits, root vegetables, grain products and legumes all are prohibited. A Michigan Medicine dietician explains how the popular low-carb regimen can get results — as well as related risks everyone should know.