bool hasPermission = false;
await Nutrition.requestPermission().then((value) => setState(() {
  hasPermission = value;
}));

DateTime endDate = DateTime.now();
DateTime startDate = DateTime.now().subtract(Duration(days: 7));
Nutrition.getData(startDate, endDate);

DateTime date = DateTime.now();
Map<NutritionEnum, double> nutrients = {
  NutritionEnum.FIBRE: 10,
  NutritionEnum.FAT: 5,
  NutritionEnum.PROTEIN: 2.5,
  NutritionEnum.CARBOHYDRATES: 100
};

// Pass a Map<NutritionEnum, double> and a date
Nutrition.addData(nutrients, date);