Hi there,

I found a bug on visual food regen if we use World.setDifficulty() in a plugin onEnable(): the food visually keeps onEnable() difficulty even if we change it after (like using /difficulty or later World.setDifficulty).
It's really visible if we set difficulty to Peaceful at launch: food always regen visually, restoring "real" level when decreasing, then increase again.

What's the problem in a nutshell?

I have made a test plugin like this, and it makes this:
<iframe width="560" height="315" src="https://www.youtube.com/embed/YyZgqpDTKow" frameborder="0" allowfullscreen></iframe>

How to reproduice?

1. Create a plugin that set default World difficulty to peaceful
2. Run craftbukkit/spigot 1.8 with that plugin
3. Change difficulty to normal in game
4. Decrease your food level (/effect <nick> minecraft:hunger 5 20 do the job)
5. Your food level will increase, like if you were in peaceful
6. Move to make a food update, the real level will be set