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Snacking isn't necessarily bad, it depends on what you're snacking on. Look for low calorie dense snacks like fruits, vegetables (like carrots or bell pepper Sticks, olives, pickles).

I have discovered that sometimes I want to snack for nutritional reasons, which @mtaratoot has covered nicely.
But sometimes I just want something to do with my hands or something to chew on.

Knitting and other crafts solves one problem.
Finding things that are satisfying to chew solves the other.

The first and easiest option is sugar free gum.
Other possibilities are:
Miswak sticks. Sometimes called peelu. They’re available on Amazon, or at a halal grocery store. They’re great for your teeth and gums, and they’re relatively inexpensive.

Amazon also has a variety of silicone sensory items for neurodivergent people who like chewing for sensory stimulation.
If you are the type of person who finds yourself chewing pencils? It’s worth considering trying one out.
Most are aimed at kids, but there are some decent ones that look adult enough.
I have a silver leaf that I enjoy.
There’s also crystal shapes, and others that don’t look out of place on an adult.