Can you go to a dietician that specializes in sports nutrition? I agree that looking at the sugar in your diet is a good idea, but getting a good medical history and where you are at now in your exercise/nutritional/body composition is what they will assess and tell you what to look at. Trainers cannot do this unless they have the added training as a dietician (or nutritionist but I am all for the dietician). Be careful with that, I've seen people cut alot of sugar from their diet including the natural kind. And everyone is different so you should get it squared away for you! As an example tho of what I was told, not to eat packaged foods with more than 5-7 sugars listed. Good luck with that one! That is what convinced me why bother with stuff in a box.
But in respect to sugar, for me, I don't eat HFCS, which I swear made a difference for me in the big craving of sugar vicious circle. I don't use artificial sweetners, even Splenda. However, I got this stupid stomach thing and I started eating processed food. Guess what? I feel WORSE! I'm not sure now if it's the stomach bug, some other illness or my dietSo for me, there is something to avoiding processed food with lotsa sugar. I still use sugar (raw demera or turbinado) in coffee or tea, but not like I used to. And if I go to Starbucks, I don't get the syrups anymore. I found they really set me off.
But I know people that are runners (how bout them runners) and triathletes that live on sugar. If I ate as much sugar as they did I would feel horrible. But if they ate as little as I did, I think they would probably not feel so good either.
SO now I need to go through sugar detox (aka fake food cold turkey). I still eat fruit and milk of course has it's own sugar (that is why you will always have sugar in yogurt because of the lactose-even if you make your own).
You probably are taking this into account, but if not...there is a difference between "sugar" like in the ingredients list, and "sugars" on the NI lable. Even my plain, ff yogurt has 10 g. of "sugars" that are naturally occuring. Orange juice has 22 g per serving etc, even with no sugar added. I think you are mostly concerned about added sugar, the kind you find in the ingredients list.