Eating a high-carb food - even as the occasional treat - could take you out of ketosis. It’s a good idea to test your ketone levels to know if you’ve been kicked out of ketosis. For these reasons, you may know people who purposely (and regularly) schedule treats, including on the weekends or at the end of the month. If you’re following the keto diet because of these health reasons, it’s important to know that eating cheat meals can cause blood sugar levels to spike. Intellectually, you know a cheat meal won’t help with your weight loss goals or allow you to experience the positive impact of the keto diet. This, in turn, could slow any progress made toward weight loss and fat loss goals (i.e. the reason you started keto in the first place). The Key Alternative High Fat. One meal high in saturated fat can make the cause of diabetes-carbohydrate intolerance-worse within four hours. Having a regular dose of glucose can prevent your body from becoming fat adapted.