Another a part of Cognitive Behavioral Natural Pure Keto Therapy is to challenge your negative self talk and to call its bluff Another a part of Cognitive Behavioral Therapy is to challenge your negative self talk and to call its bluff - by standing up to your worries and jumping in to whatever it's you're afraid off. That way you convince yourself that the priority was supported nothing. - by standing up to your worries and jumping in to whatever it's you're afraid off. That way you convince yourself that the priority was supported nothing.