Sucrose is sugar, sugar decays teeth
I would give him a short shot and make him run up because chances are if he likes baseline, he might not be as good as volleying.
Answer:
I think it's all of them.
Give you lack of nutrition and will take a toll on your ability to function through out the day. feeding your brain is like getting rest so you are recharged with out it you get tired sluggish and grumpy easily.
You have to give him time don’t force it on him let him make his own decisions and maybe he will be with you but you can’t force him into it. :)