Having blood pressure that's too high or too low isn't a good thing.
Uhh...
Maxx is talking about Blood Sugar levels, not Blood Pressure.
Blood Sugar levels are linked with diet, for the most part.
But are also linked to diseases like Diabetes.
Hypoglycemia, having too little glucose in your blood plasma, isn't a good thing.
It means there isn't enough glucose in your blood being transported around your body.
This can mean that there isn't enough glucose for efficient respiration of your cells.
You can find yourself being drowzy, dizzy, tired or physically fatigued. You can even faint or worse.
If it gets really low (which can happen to those who don't pay attention to it), it can in causes cause people to go into Hypoglycemic Coma's.
This happens because the nerve cells in your brain don't have any sort of energy store, so when they are restricted of glucose, they can fail and shut down.
I would suggest you talk to your Doctor about it, to see what can be done.
It's best however to maintain a healthy balanced diet with a good lifestyle.
Don't completely avoid sugared items, and don't avoid things like carbohydrates.
Carbohydrates (like bread, or cereals) are really good, as they act as slow-release energy.
Just, don't take this to excess.
If you start eating too much sugared foods or whatnot, you can cause Hyperglycemia, which is just as bad. (It's having too much glucose in your blood, and it disrupts water potentials of cells, and causes dehydration and damage to the cells of the body. It most badly damages nerve cells too).
You can also risk leading into giving yourself Type 2 Diabetes.
This is generally caused by having too much fat, but you don't necesarilly have to be very fat to get it.
The answer really is to properly balance your diet and lifestyle. Eat healthily and exercise.