ListView mostra linhas em branco

Olá! As linhas do ListView não mostram o texto. Porém, o ItemTapped funciona perfeitamente. Ele chama a página correspondente. O que pode estar errado?

//MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace Clinica.Views
{
    public partial class MainPage : ContentPage
    {
        public List<string> ItensMenu { get; set; }

        public MainPage()
        {
            InitializeComponent();

            this.ItensMenu = new List<String>()
            {
                "Consultas",
                "Programa de fidelidade",
                "Eventos",
                "Vídeos"
            };
            this.BindingContext = this;
        }

        private void ListViewMenuPrincipal_ItemTapped(object sender, ItemTappedEventArgs e)
        {
            switch (ItensMenu.IndexOf((String)e.Item))
            {
                case 0:
                    Navigation.PushAsync(new ConsultaView());
                    break;
                case 1:
                    Navigation.PushAsync(new CartaoView());
                    break;
                case 2:
                    Navigation.PushAsync(new EventosView());
                    break;
                case 3:
                    Navigation.PushAsync(new VideosView());
                    break;
            }
        }
    }
}



//MainPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Clinica"
             Title="Clínica"
             x:Class="Clinica.Views.MainPage">

    <StackLayout Padding="25" Margin="25">
        <ListView 
                x:Name="ListViewMenuPrincipal"
                ItemsSource="{Binding ItensMenu}"
                ItemTapped="ListViewMenuPrincipal_ItemTapped">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <ViewCell.View">
                            <StackLayout Orientation="Horizontal">
                                <Label Text="{Binding ItensMenu}" FontSize="16">
                                </Label>
                            </StackLayout>
                        </ViewCell.View>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackLayout>
</ContentPage>