The Minimum Calorie Budget represents the lowest permitted daily intake, and values below this limit are not accepted by the Planning tool. The default Minimum Calorie Budget is "400." However, dietitians recommend not dropping Calorie Budget below BMR (daily calories the body burns at rest to maintain normal body functions, your "rock bottom" Food Calories for weight planning.)
On the website, iOS, and Android apps, the Plan section allows setting a Minimum Calorie Budget. This can be done via the Plan > Weight & Caloriespage on the website, or by selecting Food Calorie Budget from the My Weight Goal & Plan > Weight & Calories screen within the mobile apps.
Calorie Budget changes due to many factors: enabled AutoPilot, Calorie Cycling use, the Exercise added into the Calorie Budget, change of Weekly Rate, Target Date, or Target Weight. Also, the person may sometimes decide to enter a lower Calorie Budget to lose weight faster (lose more weight for a shorter period.) So, Planning may calculate Calorie Budget below BMR. Lowering your Calorie Budget below BMR may be dangerous to your health; it has to be done only under the guidance of a medical professional.
If you need to adjust the Minimum Calorie Budget, please consult a health professional and get approval that such a setting is appropriate for your medically supervised diet. While customizing your Calorie Budget, ensure it's above BMR. Otherwise, a lack of food energy intake may result in nutrient deficiencies; also, it could cause excessive loss of lean body mass.