After reading an article about the effects of sugar I decided to forgo the refined as well as natural sugar (agave syrup, honey, etc), to see if it had an effect on my weight and skin. After one month both skin and weight were pretty much the same, but one thing changed: my headaches. I have not had a migraine since I quit all forms of additional sugar, it has been a real revelation. I never even thought sugar had any effect on headaches, or pain, but I have since had 'pleasant' periods, where my time of the month isn't a painful time where I'm reaching for pain relief.
Please note, I am still enjoying fruit, but I have completely given up adding sugar to my tea, or eating any refined sugar. I have tried a little maple syrup and agave in small doses, but overall, I'm sugar-free! It's so liberating, give it a go.