Hmmm - not sure about this but I suspect it can.
I can't eat wheat, haven't been able to for years without developing a really itchy rash, not immediately but a bit later and always in the same positions. Omit wheat - no problems. I do eat other grains.
Two years ago I had put on a load of weight - when I first went on pred I didn't put on a lot but the weight I had put on after PMR started because of immobility and lack of exercise rearranged itself to face and midriff. Then, when I moved here I was switched to Medrol and the weight went on big time. After less than a year I was desperate to lose weight. I was switched to a different form of pred and at the same time I really got serious about dieting. It wasn't long before I discovered I would lose weight if I was really strict and ate next to no carbs of any sort but as soon as I ate much more than green veg and salad I lost no weight. I don't eat sugar anyway - none in tea or coffee, no soft drinks of any sort, maybe half a dozen icecreams per summer (that's hard, I live in Italy), almost never cakes and even only about 1 piece of fruit a week.
I do notice a big difference in how I feel after a few days where I have pigged (by my standards at least) on carbs of any sort - any carb, spelt, polenta, not just sugar. If it has been a few days with sweet things (ice creams, desserts) I think it is probably worse. I also notice I feel "puffy", clothes are tight and so on, a few days on my normal diet and that has all gone.
Cutting carbs of all sorts in diet will lead to the glycogen reserves in the muscles being used up and your body switches to using triglycerides to make energy - which uses up fat stores and you lose weight as a result. When you then eat carbs those glycogen stores are replenished - I wonder if that has an effect in the muscles?
I found this statement on the Harvard Family Educational site: "The bolus of blood sugar that accompanies a meal or snack of highly refined carbohydrates (white bread, white rice, French fries, sugar-laden soda, etc.) increases levels of inflammatory messengers called cytokines" - and cytokines are what cause the inflammation in PMR. I have just been reading the beginning of a series of articles on a blog about low carb diets in ankylosing spondylitis - a prof of immunology in London some years ago found ESR fell in patients on low carb diets. So without carbs their inflammatory signs fell.
I know MrsO usually eats 3 helping of oily fish a week as well as the other anti-inflammatory foods she uses - and that if she hadn't eaten that she noticed she didn't feel as good. That's a positive effect - but I think that a negative effect is just as reasonable a concept. I haven't found real, proper medical/biochemical articles saying this yet - I shall look.
But WHY did you overdose on sugar? Were you doing something different that could have contributed?