We humans love sweet things, and therefore it is easy to get addicted to Sugar. However, eating a lot of sugar is dangerous to your health. Men are recommeded to not eat more than 150 calories (9 teaspoons) and women are recommended to not eat more than 100 calories (6 teaspoons) of sugar [1].
So, what will happen to your body if you simply go cold turkey and stop eating sugar altogether. Well, as it turns out, stopping eating sugar would be very beneficial to your health. These health benefits are listed in [2].
Basically, you'll lower your blood pressure, greatly reduce the risk of getting Diabetes, reduce the risk of Tooth decay, reduce Depression and Anxiety, sleep more easily in the night and won't be having brain fogs anymore. Even your head would hurt less.
However, stopping eating sugar is easier said than done, as we are so much addicted to it. A good alternative would be to eat more fresh fruits as well as nuts, for snacks.
References
[1].https://www.healthline.com/nutrition/how-much-sugar-per-day#section3
[2].https://www.bewell.com/blog/stop-eating-sugar/