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As usual Alex Hutchinson does a great job summarizing the research : https://www.outsideonline.com/2060591/latest-low-carb-high-fat-diets https://www.outsideonline.com/2060591/latest-low-carb-high-f... If 70% or more of your calories come from fat, your body starts increasing its fat oxidation rate, but it also down regulates the carb burning pathway