Celery is the go-to for crunch in induction. As you climb the carb ladder, and you use Net Carbs, other crunchy raw vegetables become doable. I've been on a jicama kick lately, and because near goal, have added carrots for fiber too (Dr Fung's plan does not view carrots as a sugar devil). You might even consider adding some of those gluten-free crackers found now in that section made of rice, ground flax (?) or ground nut flours (? Is it the product or the size of the nut that is the problem..I do not know about this, check with your doctor?)