The best replacement for high fiber is high protein.

The best alternatives to high fiber are rated as following:
★★★★★  high protein
★★★★★  low fiber
★★★★  low carb
★★  low carb diet
  whole grain

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Speaking about high fiber, one probably shouldn't forget about carbs.

Other search terms related to high fiber and their ratings are:
★★★★★ carbs
★ grains
low fat diet
You have in mind a companion for high fiber and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of high fiber in all years. Click on graph for more.
high fiber
high protein
low fiber