Does your skin really get better if you quit eating sweets?

These days, I'm so stressed out from work that I eat a bag of snacks every day after work and then go to bed. But suddenly, I've started getting a ton of breakouts on my forehead and chin...ㅠㅠ My skin wasn't that sensitive to begin with, but sugar and flour are definitely bad for me. I think it's my eating habits, but it's so hard to quit snacks. Sob. Has anyone found a way to clear up their skin by completely cutting them out? I'm curious to see how effective it is. I'm also going to try to cut down from today, but is it really because of the snacks? I feel so upset every time I look in the mirror.