public override async void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);
            if (HKHealthStore.IsHealthDataAvailable)
            {
                var success = await HealthStore.RequestAuthorizationToShareAsync(DataTypesToWrite, DataTypesToRead);

                if (!success.Item1)
                {
                    Console.WriteLine("You didn't allow HealthKit to access these read/write data types. " +
                                      "In your app, try to handle this error gracefully when a user decides not to provide access. " +
                                      "If you're using a simulator, try it on a device.");
                    return;
                }

                numberFormatter = new NSNumberFormatter();

                UpdateUsersAge();
                UpdateUsersHeight();
                UpdateUsersWeight();
            }
        }