Blitz Keto Reviews Stick to the keto diet for three to six months max, says Mancinelli, noting that some people opt to cycle in and out of the diet throughout the year. In the grapefruit diet, people eat grapefruit with almost every meal. BlitzKeto You also shouldn't be relying on fatty meats to hit your fat quota, she adds. An October 2016 study from The Journal of Clinical Endocrinology & Metabolism followed 20 obese adults, who were put on a low-calorie keto diet, lost an average of 40 pounds over four months.
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