Yeah, you can easily find sugar in pretty much everything we eat. So avoiding it is a pretty thing, but not everything, it's also about how much we eat as well, for the gains or just to lose weight. All the protein man.
I have been doing rock climbing for about a year now. I have never realized how diet programs have affected so much on my progress until recently. Now that I know how to balance it more, I have been both losing weights and my grip strengths have also been insanely stronger as well. Much much better than my first 9 months of climbing. Like I don't really have much physical changes but I can feel that I can lift up way heavier things for a longer period of times now. I may sound old for this but health reason also keeps me going as well. My health has been so much better ever since I started as well.
GOTS TO GETS THEM PROTEIN FROM THAT XXXXXXXXXL BURGER FROM MCD'S AMIRITE. Sugar isn't inherently bad, it's just that people over consume it/don't work it off so the fat just keep compiling. I'm not only doing the diet for, well, losing weight (I have minimal interest in specifically losing fat, strength is my main concern, but I still do cardio) but also doing this as a favor to myself in the future. God knows what sugar filled products we'll have in the future, and I want to get rid of any sort of addiction before my life or general future in terms of health and athletics is fucked.
You do rock climbing? I had no idea haha. Grip strength is actually something I have been having a bit of problem with, and since it's such a major part in rugby (Specifically in lineups where I lift a person from behind with my hands and forearms), I'm almost tempted to join the local rock climbing club in my school. For now I've been timing myself with how long I can hold dumbbells and doing four sets of that length, circa 1-2 minute break between. Current record is one minute with 18 kilos. There's no need to feel ashamed for doing it specifically for health reasons, hell, it's good that you do it for your health. A healthy body is a good way of keeping yourself happy.