I had a nutrition course when in college. I'm not certified. But

I think I can offer up a few tips...

First of all processed sugar is the worst. It plays on mood swings too.

Unprocessed & raw natural sugars are better. I'm not big on
sugar substitutes in the long run they get a bad rap.

Try foods sweetened with fruit juice or cane juice. Kashi makes
some good snack products high in fiber and protein, low in
sugar.

Fruit fruit and more fruit. All natural juices, read the labels
food companies deceive the consumer all the time. Some juice only
contain 10% real juice hence adding just water and more Sugar!

I know its hard to stay away from the great sugary desserts and
snacks, I go for a 5-10 min walk if I feel like Indulging.

A good rule of thumb if its not in the house then you can't eat it...!!

Hope this has helped some....