The best replacement for no carbs is low carbs.

The best alternatives to no carbs are rated as following:
★★★★★  low carbs
★★★★  no fat
★★★★  no meat
★  carbs

Your alternative for no carbs is not listed? Suggest!
Speaking about no carbs, one probably shouldn't forget about protein.

Other search terms related to no carbs and their ratings are:

★★★★★ protein
★★★ proteins
evening meal
You have in mind a companion for no carbs and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of no carbs in all years. Click on graph for more.
no carbs
low carbs
no fat