From what I understand, yes. My brother got into health-foods and weight lifting many years ago, and he ran a natural-foods and natural-health store for many years too. That type of thing is his passion, so he learned a lot. And I learn a lot from him. He told me that research has shown that granulated sugar (really any type of processed or refined sugar) leads to inflammation of our organs and internal structure, and prolonged "inflammation" over time can lead to the diseases and cancers we all know about. Apparently something about how the body processes sugar. I don't know all the details myself, but I think it's something worth investigating.
I personally try to steer clear of refined sugar when possible, but frankly most sugar alternatives (agave nectar, honey, maple syrup, or others) are quite pricey around here, so I usually just try to use refined sugar in very moderate portions. I would love to be able to afford to replace all my sugar intake with agave nectar or stevia someday, but right now it just isn't financially possible for my family.
My Long-Term Weight Loss Goals!
The Great Father-Daughter Weight-Off!