C# composition over inheritance : DotNet Fiddle : https://dotnetfiddle.net/d6ZAG7

Character_Program.cs

using System;

namespace Test {
	//Interfaces : contracts for classes to be used for compoisiton
	
	public interface IEat<T>{
		//set the food level
		int Consume(T Item);
	}
	public interface ISpecies{
		void Draw();
	}
	public enum Health {
		Sick, ok, good, healthy	
	}
	public interface ICharacterState {
		Health CharacterState {get; set;}
	}
	
	public interface IHealthValue{
		int HealthLevel(int value);
	}
	
	//classes for componsition
	public class Mamal : ISpecies{
		public void Draw(){
			Console.WriteLine("I am a mamal");
		}
	}
	public class Reptile : ISpecies {
		public void Draw() {
			Console.WriteLine("I am a reptile");	
		}
	}
	public class MyHealth : IHealthValue{
		
		public virtual int HealthLevel(int value){
			if(value > 80){
				return 80;
			} else if(value > 50){
				return 50;
			} else if (value > 20){
				return 20;	
			} else {
				return 5;
			}
		}
	}
	
	public class StateOfCharacter : MyHealth, ICharacterState {
		
		public Health CharacterState {get; set;}
		
	}
	
	
	public class Food {
		public int rejectLevel {get; set;}
		public int consumeLevel {get; set;}
		public string name {get; set;}
		public int sugarLevel {get; set;}
		public int fatLevel {get; set;}
		public int vitaminLevel {get; set;}
	}
	
	public class Apple: Food {
		public Apple(){
			this.rejectLevel = 1;
			this.consumeLevel = 2;
			this.name = "Apple";
			this.sugarLevel = 10;
			this.fatLevel = 0;
			this.vitaminLevel = 15;
		}
	}
	
	public class Cake : Food {
		public Cake(){
			this.rejectLevel = 0;
			this.consumeLevel = 10;
			this.name = "Cake";
			this.sugarLevel = 60;
			this.fatLevel = 39;
			this.vitaminLevel = 3;
		}
	}
	
	public class Eat : IEat<Food>
	{
		public int Consume(Food Item){
			Console.WriteLine("Yumm.... {0}", Item.name);
			return Item.consumeLevel;
		}
	}
	
	public class Reject : IEat<Food> {
		
		public int Consume(Food Item){
			Console.WriteLine("Yuck... I hate {0}", Item.name);
			return Item.rejectLevel;
		}
		
	}
	
	//abstract class that contains all of the methods
	public abstract class Character : IHealthValue, ISpecies {
		
		private readonly IHealthValue _healthValue;
		private readonly ICharacterState _characterState;
		private readonly ISpecies _speicies;
		
		public Character(IHealthValue healthValue, ICharacterState characterState, ISpecies species){
			
			_healthValue = healthValue;
			_characterState = characterState;
			_speicies = species;
			
		}
		
		public void Draw (){
			_speicies.Draw();	
		}
		
		public int HealthLevel(int value){
			return _healthValue.HealthLevel(value);	
		}
		
	}
	
	
	//concrete class that contains all of the functionality
	
	public class Bear : Character {
		public Bear() : base(
			new MyHealth(),
			new StateOfCharacter(),
			new Mamal()
		) {
		
		}
		
	}
	
	public class Program
	{
		public static void Main()
		{
			Console.WriteLine("Hello World");
			Bear teddy = new Bear();
			teddy.Draw();
			Console.WriteLine(teddy.HealthLevel(80));
			
		}
	}
}